Return to site

Disk On Key Format

broken image


Type the following command to format the partition using the NTFS file system, set a drive label, and press Enter: format FS=NTFS label=Data quick In the command, remember to replace Data for the. Universal Disk Format (UDF) version 1.50 and above has facilities to support rewritable discs like sparing tables and virtual allocation tables, spreading usage over the entire surface of a disc and maximising life, but many older operating systems do not support this format.

Helping people with computers.. one answer at a time.

Microsoft office 2013 free for mac os x torrent. We'll look at where to find your Windows CD Key.

by Leo A. Notenboom, © 2005

How do you find the CD Key of the Windows CD you have? I have a Windows XP Pro SP2 installation disk but I don't know the CD Key. Can you locate it on the CD? I do not have this installed on any other computers so I can't search the registry for it either.

There's a lot of confusion about CD or, more properly, 'Product Keys', thoselong strings of numbers and letters you need to type in when you installMicrosoft Windows.

One source of confusion is where the CD Key comes from.

One hint: it's not on the CD.

• Juegos on line gratis.

The fact is that for any given version of a Windows CD, the CDs are all thesame. The key to unlock the CD is not stored anywhere on the CD. If itwere, each CD would have to be slightly different - it's not quite amanufacturing nightmare, but it's at least a bad dream.

'You may think you're purchasing a CD, but in fact, it'smore like you're purchasing that product key.'

The product key is typically printed on a label on the product packagingcontaining the CD when you purchase it. If you look closely at several copiesof the same product, you'll see that the key is different on each label.

You may think you're purchasing a CD, but in fact, it's more like you'repurchasing that product key. Any CD will do, but it's your possession of aunique product key that verifies you as having purchased a legitimate copy ofthe product.

A CD without a product key? Without your unique product key? Notworth very much.

One of the reasons that the product keys are unique is to prevent piracy.Each person should receive a unique product key, and thus that product keyshould be used to install on only one machine. Microsoft is fairly vague onthe details of 'product activation', but it's likely that one of the things itchecks is that the product key you entered is unique, and not already in use bysomeone else, or on another machine.

Now, if you have a legitimate, working installation of Microsoft Windows,you can, in fact, get the product key without the sticker. There's a free tool:KeyFinder, that will report yourproduct keys for Windows, and several other installed programs.

So in case you haven't guessed, those product key stickers are valuable, andshould be saved. Or at least make sure to save the product key informationsomewhere. If you ever need to reinstall Windows, you'll need the product keyagain. I've actually collected all of mine and placed them in a spreadsheet forsafekeeping.

And, I'm sorry to have to bother most of you with the following, but I knowI'll get the questions if I don't:

  • I cannot retrieve your product key for you.
  • I cannot activate a product for you.
  • I cannot give you a product key or activation code for anyproduct.

Article C2490 - December 15, 2005 «»

You may also be interested in:

  • How can I find the XP installation CD key used on my system without having the CD? There are freeware utilities that will find the installation CD key used on your system for you if you do not have the CD.

  • I don't have an installation CD for Windows XP - what if I need one? At some point you'll need your Windows installation CD. If you don't have one, you could be out of luck. Be sure to get one and keep it safe.

  • How can I get another activation code without paying for another CD? If you lose your activation code you may get help from the product manufacturer if you can prove you have a legitimate copy. That may not be easy.

Russell Taylor
May 15, 2006 12:14 PM

There is a program that will find your product key for you. it works with microsoft windows and office. you can view or change your keys with it.
www.keyrecover.com

En-Cu-Kou
May 23, 2006 8:09 PM

Hello
I visited the site mentioned above (keyrecover.com), and found out they have a copy of this article in their Resources section -- except the link to the free KeyFinder is simply changed to one for their non-free KeyRecover! If that's not a crime in America, it's at least beyond rude.
No comment about the implications about the trustworthiness of KeyRecover corp.

Leo
May 23, 2006 8:49 PM

Thanks for letting me know. I've contacted keyrecover.com.

martin
August 7, 2006 9:33 AM

i have installable cd for windows xp home edison but i dont have cdkey how can i start windows

Leo A. Notenboom
August 8, 2006 9:12 AM

You'll need to purchase a key, or a CD with a key.

Nigel
December 7, 2006 7:17 AM

im preparing to reinstall windows xp sp2 home edition..i have a genuine installation key but i cant find my cd..would it make a difference if i used another windows xp sp2 home edition cd to install it as long as i have my original key???

Leo Notenboom
December 7, 2006 6:11 PM

Any SP2 XP Home CD will work fine.

ghghgh
February 22, 2007 5:18 AM

search unattended in the search facillity and search the disk. it should be a txt file and its in ther

Kerrie
March 1, 2007 10:29 AM

I understand why the product key is not on the CD. And I understand that you are basically purchasing the product key. But. how does the computer know you are using a unique key? I'm not connected to the internet.

Leo A. Notenboom
March 3, 2007 9:53 AM

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

There are two things that validate keys:

1) they are not just a random string. There's an algorithm that
determines what is and is not a valid key. So you can't just enter a
random string of characters and have it work. Only actual, valid keys
will work.

2) activation. Normally you activate over the internet, and that double
checks whether the key has been used previously. If you're not connected
to the internet, I believe phone activation is required and would do the
same thing.

Leo
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (MingW32)

iD8DBQFF6bZfCMEe9B/8oqERAhjCAJ9v+KENW2rt/slww/7h31ZiLgVWxgCfcjQ+
jSNwUcu+C1VyPJYS4coticM=
=19jV
-----END PGP SIGNATURE-----

Rob
May 11, 2007 6:48 PM

You can find the XP Key on the CD and it is very easy to do.Put the XP CD in your Drive and right click explore.Now click on search and type in Unattend. When search finds this file on your CD, open it with NotePad and scroll down to the bottom, and there in all it's Glory will be your XP CD KEY.

Leo A. Notenboom
May 12, 2007 5:32 PM

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

It's *a* product key, but it's not the product key on the outside of the box.

My expectation is that this is a placeholder that's meant to be replaced with
your real product key if setting up an unattended installation. I'll bet that
if you use it, your Windows won't activate.

FWIW I found it in i386unattend.txt.

Leo
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (MingW32)

iD8DBQFGRlyTCMEe9B/8oqERAnIxAJsFatuuh9zpQxVFZS6ONqJEQ+sqkQCcDbXY
MYzCWoBW36S7Kc8Z64vjVaE=
=ipGj
-----END PGP SIGNATURE-----

Bowlday (IT Pro) Network Spec.
December 18, 2007 9:08 PM

Yes, you can get the product key from a windows xp home cd.
How do u think it states the correct key with cd without being online. Leo do you work for MS. Or just didnt know??

Find Windows XP Product Key from the Windows XP CD:

1) Insert Windows XP cd into a working computer.
2) Exit the Autorun introduction.
3) Open 'My Computer'
4) Right Click on the Windows XP cd-rom drive and select explore.
5) Open the USWXP32P_ZX folder.
6) Open the sysprep folder.
7) Open unattend.txt

Your CD's product key is contained within the unattend.txt file.

Note: On some system disks, USWXP32P_ZX is a hidden folder.

This is MS OS 101 and perfectly legal

Robert
January 6, 2008 7:43 PM

This does not work!!!!!
It gives you a cd key but it will not proceed get an error.
The Product Id you entered is not valid!

Disk On Key Format
Leo A. Notenboom
January 7, 2008 11:15 AM

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

You have to use the CD Key on the same product. CD Keys for
one product or version of a product will not work with
others.

Leo


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (MingW32)

iD8DBQFHgnpNCMEe9B/8oqERAtfoAJ44eijYMSg2Pccd5OULvNhV/mfVxACfcDtu
Om1cEu8nYWnE4eiFMUZHs48=
=HoQu
-----END PGP SIGNATURE-----

Brody
January 7, 2008 4:22 PM

Omg thank you sooo much i didn't have the cd key for my windows xp media center cd, but using the 'Unattend' system i got it thanks a million!

Trevor
May 9, 2008 3:13 PM

Wow, I just found your site.
It's amazing!
I know this won't help someone who's lost their CD key.
The first thing I do when I open a CD is use a marker to write the CD key on the printed side of the CD.
That way I can't lose it.

Graham
October 8, 2008 1:30 PM

You are wrong, the CD key is stored on windows XP cd's I'm pretty sure with vista as well. I'd have to look up the exact file location, but the CD key is in a text file named UNATTEND, It's either the first or the last thing in the file.

Yep, there's a product key in I386unattend.txt and it's the same on all CDs for a specific version or CD-pressing run. It is NOT the same as the key on the outside of the box, and it is not a valid key for you to use on subsequent installations. Since it's not unique I'm guessing that if you attempt to use it activation will probably fail.
Matt
February 9, 2009 11:53 AM

If you explore the windows cd and open up I386 it does reside in a file named UNATTEND.txt. I have successfully used this on VALID windows installations. Still working to this day, have never been blacklisted.

Dan
February 25, 2009 9:35 PM

bull vista has the key on the cd

Charolotte Harvey
March 12, 2009 9:17 PM

There are several programs out there freeware that you can run and get the xp key code. Microsoft office and internet explorer. One of them is winkeyfinder. Another is jelly bean magic. Just put them in search and follow the links for download

Sean
April 10, 2009 3:44 PM

Ummm....This article is wrong wrong wrong. The product key IS ON THE CD. It is in a folder name I386 and the name of the file is UNATTEND.txt.

Edna
April 11, 2009 6:35 PM

Matt, 2/9 poster. Thank you SO much. You saved me and your suggestion Worked!!! I am so glad that people are not afraid to share their knowledge.

Tony Frost
April 15, 2009 5:48 AM

The 'key' in the folder will only get you through the first hurdle when installing Windows. However when it comes to veryifing online, it won't work.

Allen
May 16, 2009 3:01 AM

Matt, thanx man, you are the only one who knows anything on here.

Deg
June 2, 2009 3:23 AM

I have found a genuine xp disk and tried loading it using the number found in the text file, but it did not work and said the product ID is not valid, so I think the batch, or run number seems to be correct, so the cd is of no use, but thanks for the try anyway.

IT Professional
July 17, 2009 7:40 AM

Leo is completely incorrect. Not all versions of the install disks are the same. There are MANY different disks, each meant for a specific distro. For example, if you have a legit key from an XP cd you purchased direct from the store, that key will not work with an OS purchased from dell. It will also not activate a system that was installed with a store bought copy of xp that has sp2. If you buy an XP sp2 install disk, it wont work with the origionals. There are also VLK copies, which wont work with retail keys. Sorry for the blatent post, but I found this article specifically because i am coding a program now to validate the serial key to a copy of xp BEFORE installing it, as in the IT field, we run across alot of installs where the customer has the license key, but not the origional content.

I probably should have been clearer, but I wrote 'for any given version of a Windows CD, the CDs are all the same'. I did not mean to imply that all XP Home's for example are the same, but that all the variations you list comprise different 'versions'. But if you get two disks of the same OEM's disk of a specific build of a specific variation of Windows XP, all those CDs will be the same.
Bottom line is that I think we're actually in violent agreement - and that I'm not actually 'incorrect', just unclear perhaps.

Pookey
July 28, 2009 11:06 PM

All XP Professional RETAIL Disks are the Same. All XP Home RETAIL Disks are the same. The OEM Disks (the ones you get when you buy a pc with Windows on in) are different for each manufacturer. The way OEM works is that the PC maker loads a special file with their OEM 'Code' inside. If the 'code' matches with your motherboards serial, RAM, Graphics Card, First HDD, First CD Drive, First Floppy (If Present), Memory Controller, Sound Card, Ethernet Card, then windows will install WITHOUT activation. However, if you change a single piece of your pc, windows will need to be activated as it is no longer an 'original pre-built' pc.

Retail and VLK keys are also interchangeable and usable on the same CD. You people saying that the key inside UNATEND.txt is real are WRONG. Microsoft add the key so that businesses and PC manufacturers can perform mass installs with the same product key without having to activate. HOWEVER, the key becomes invalid 30 days after the OS was installed so a legitimate key then needs to be entered. The key is never on the disk; instead there is a non-reversable algorithm which checks if the key can be used. When you activate, Windows checks that it hasn't been used to many times.

In the case of Windows Vista, EVERY SINGLE DISK is EXACTLY the same, except, once again, for OEM Disks. All VLK and RETAIL disks are the same and contain EVERY version of Windows Vista.

Some people need to do more research. I know these things because I have my one Windows Keys and i also have a VLK license. I also create unattended and slipstreamed XP Disks.

Greg
September 8, 2009 3:30 PM

Just wanted to offer a correction. The file unattend.txt is a sample configuration file for setting up an unattended installation. It contains sample data, including the product key. The XP installer would not accept this as a valid product key (Whistler version).

charles
September 24, 2009 7:06 PM

Leo i have to beg to differ with you about any xp cd will do it will not. i have tow legal copies of windows xp and you can't switch the numbers it says it's incorrect. i have a copy of xp that doesn't require a key or activation to work. when i reformat my computer is offline and therefore has no connection to the outside world so there is no way to see if it is a good key. it all has to do with looking for you to put in the correct string of letters and numbers and compare to whats on the DISK. i have Microsoft office 2003 that like xp requires a string of letters and numbers to continue installation. guess what the product key is on the disk there for comparison.
i have a program that compares two cd's and and shows the difference and there you have it the product keys for both xp cd's.


Till next time

Tom195
September 29, 2009 6:29 PM

Ummm....This article is wrong wrong wrong. The product key IS ON THE CD. It is in a folder name I386 and the name of the file is UNATTEND.txt.
Posted by: Sean at April 10, 2009 3:44 PM

Sorry SEAN,
If you have a copy of a CD with a product key, then you already know that you are holding an ILLEGAL, PIRATED copy of Windows.

Windows CDs are NOT individual products with their own product key, which is why the certified label is included with them.

jesse
October 11, 2009 10:20 PM

With KeyFinder you can find any key from your computer. Try it out

http://rapidshare.com/files/291860103/Free_KeyFinder.zip.html

Shane
November 26, 2009 4:14 PM

Hi Leo,
does this mean that i can use any windows xp install disk to install the software as long as i have a genuine product key?
I have a laptop with the Windows XP Home Edition product key on a sticker on the underside of the computer. Will this key work to validate a windows installation, regardless of the source of the disk?
Thank you in advance for your assistance
Shane

Note quite. Not all XP Install CDs are the same - they vary depending on version (Pro, Home, etc.), age (with or without SP1, SP2, etc.), language (English, others) and OEM or not (Dell, HP, or full retail). If you get the same one that your product key applies to, then it should work. No way to tell from the product key, but you should be able to tell by looking at your previously installed system.

Shane
November 26, 2009 4:18 PM

PS,
if you need more specifics such as the laptop make and such to answer this i will oblidge

Craig
December 6, 2009 3:06 PM

Just to bring all of you peolpe up to speed. NO you can not find the CD on any copy of Windows. It just does not excist. If you do have a file called UNATTEND.TXT, it is simply a file created to allow the cd to be installed to a batch, as in the exact same computers, for a large company that has purchased the systems and computers. It is only reg to those systems and company. It will not work on any computer. The only issue I do have is, even with unattend and putting in the CD key that does come on the computer will not work, even with the proper version of XP. The key is for pro and the key will not work with the copy I have. I end up running through the online verification every time to authorize it.

Old Geek
December 21, 2009 6:32 PM

Leo,
Thanks for clarification on some topics. I just wanted to clear up some confusion some of your readers may have about the UNATTEND.TXT file. The only purpose of UNATTEND.TXT is to allow you to do an unattended installation (i.e you don't have to answer the prompts during installation). This streamlines and automates installation. The UNATTEND.TXT is a sample. The installer needs to modify this file and include their unique information, including the product key. It can be used to set up multiple computers, but is used with a Uniqueness Database File (UDF), which contains settings unique for each computer, such as machine name.

Good web site. Keep up the good work.

Thanks. Unfortunately we still see lots of people going 'OMG! You can use the unattend.txt file!' when, of course, it'll eventually fail either installation or activation when that, as you say, sample key was used.

matthew
December 29, 2009 5:06 AM

Format Disk On Key With Disk Management

hi, yes there is a sample file for an unattended build on all the c.d's, and if you get a few of them you will find that they are all the same product key, sometimes it will work to enable you to load the software, but to activate it, it then goes online and checks your code, to which it will fail.

Conway
March 3, 2010 11:13 AM

It's very easy to find the original key if you have the cd, because it is on the cd!! Just follow these simple steps.

1.Insert the Installation CD into your CD or DVD Drive.
2.Explore the CD and navigate to the i386 folder.
3.Open the file UNATTEND.txt and scroll down to the last line.
4.You will find your Windows XP Product key there.

That is not your product key. You'll note that it does not match the key that's printed on your box. Likely you will NOT be able to activate your copy of Windows.

gerald
April 2, 2010 8:04 AM

hi ,i thing the product key is not like the original of my license product key.is that?because my prduct key label in hir in my lop top.but i cant see the other letters of that so i try your aplication. but this is not match in my label.is your key is working?>

Angela
April 13, 2010 12:00 PM

So true..thank you!!

When I thought about it this really makes sense.

Keith
May 3, 2010 4:29 PM

How do I find key on disc if it had been intergrated?

PRADIPTA KUMAR PANDA
May 12, 2010 12:03 AM

After entering the product key it is displayed that it is invlid

PrivateWalker
June 4, 2010 12:30 AM

Sorry Leo, you are so, so, wrong.
To find the installation key on the CD
(in this case, WIN XP Home Edition)
If it autoruns, exit.
Then START - MY COMPUTER - Right click on the drive your install disk is in, - scroll to EXPLORE - Double click Folder I386 - scroll to WINNT.SIF (1KB)
Open with Notepad.
You can't imagine the elation I felt when I first discovered this. Hope you will feel the same!!

Ah yes, the unattended installation file. Not all people have it, and for most who do the product key therein is bogus and will likely get you the 'this is not a valid Windows installation' message some time after you use it. But hey, if you believe it works have at it. I won't.

PrivateWalker
June 7, 2010 5:57 AM

Leo, re: your comment on 5th June 2010 about finding the product key on the XP Home Edition disk.
You are describing a totally different file on the disk! Yes, I am well aware that there is a dummy key in the I386,UNATTEND file, to which you refer.
I maintain, for anyone reading this, that the key in I386,WINNT.SIF file, (a totally different place on the disk), is good.

Boyd6944
June 23, 2010 7:52 AM

PrivateWalker is absolutly correct, I checked both places. UNATTEND and the WINNT.sif file, the Product Keys are completely different.

Adam
June 30, 2010 4:31 AM

Just referring to PrivateWalker comments, I thank you for the comment, I have been looking everywhere for this information well done

marco
July 9, 2010 9:00 AM

If the key is not on the CD, why the XP key printed on the label of my PC (crashed) is invalid when I try to reinstall the o.s. using a win xp installation disk?.
Moreover, I don't think that Microsoft can check the validity and unicity of the key during installation, since the o.s. can be installed without any internet connection active.

Johnny
July 18, 2010 6:58 AM

I have the original MS XP Service Pack 1 CD.
I tried UNATTEND.TXT and the product key given there didn't work.
I couldn't find WINNT.sif

Which is exactly why I've been saying that the product key is not on the disc. You need to get it from the box it was in, or the machine it was originally installed on.

Disk On Key Format


VICTOR
July 26, 2010 11:16 PM

the key is on the cd, i have been a computer tech for over 9 years, sometimes the key will not activate windows in that case you will need to change your windows key to the key on the coa sticker that you should have on your computer, then you can activate, if the key wasnt on the cd then you would not be able to install but like i said you might have to change it, the windows key should match the coa sticker

kevin breakfield
October 21, 2010 10:01 PM

i actually found the product key on my windows xp cd,inside the config files,just go to another computer and open the cd and then go to a file called i368 and in there u will find a config or setup config file and this will open up an internet window which will show the product key.

J Davis
July 11, 2011 1:03 PM

I think that you should know, your article is totaly incorrect ! ALL MICROSOFT DISK HAVE THE KEY ON THEM, in fact the way that they at produced there are any were from 25 to 100 keys. some times it is as easy as looking in the config file as the other post said, but in most cases you will need a working computer and a program like'DriveSpy' to search for the key. This is a very time consuming thing to do!

This information I know to be true! With 35+ years as an IT Pro/System Administrtor I hve worked withevery OS from Microsoft, from MSDos to OS 2 to Server 2008 Data Center.

So please in the future if you do not know the answer for people then do not post something that is wrong!

Needless to say it's I who believe you are wrong. This has been hashed and rehashed in prior comments.

JustCurious
July 11, 2011 9:48 PM

Dear J Davis and Leo:

I used to slap PCs together and install the software. Just for fun, of course.

Ever since I found out about the file where the KEY is supposedly stored, and Curious as I am, I checked this unattend file on every WinXP CD that passed my hands.

Well now! Guess what? Appears you are both correct.

In every case this file contained a CD Key, but in using it to install WinXP, not in every case this key was valid.

Does it make sense? Who knows, or better yet .. who cares?

But, don't take my word for it. Find out for yourselves.

barry
July 22, 2011 10:59 AM

i have and old hp paillion a1243w moldel and lost the cd , with home edition on it i tryed getting one from hp no luck don't have them any more. So made recovery disk from my buddy but can only load to were you enter keys please Help Ty Barry

Liam
December 13, 2011 11:04 AM

It was fantastic! .. i used a key on my computer and it worked. Both methods should work but my key worked too.!

Dan78
January 7, 2012 12:55 PM

I dont understand, the product key in the 'unattend.txt' file is the same on all the discs i've looked at. but if the key is not on the cd, then when you enter the key during set up how does the system know if its correct or not !?!?

Math. Complicated math. As an over-simplification, let's say you have a 5 digit product key. The 'math' is that all combinations that add up to 13 work. So all Windows has to know is '13', and the 'rule' that the digits add up. Like I said, the actual rules and math are complex and border onto cryptography, but hopefully you get the idea.
kaptain krunchie
March 27, 2012 5:40 AM

Used 'keyfinder' to find my product key code for my installed version of XP. when I try to reinstall XP it tells me that this product code is incorrect. The shop did the last reinstall - could they have used a different Genuine Advantage kit disc?

Mark J
March 27, 2012 1:20 PM

Disk On Key Formatting

@kaptain krunchi
It might be that the XP you had on your computer was an OEM version (factory installed and made to run only on that specific computer), and the XP version you tried to install was a retail version. In that case the retail version of Windows wouldn't recognize the product key.

Jules Gagne
June 13, 2012 2:44 PM

I have read complaints that the Product Key stickers post-XP (Vista, 7, etc.) tend to fade over time, especially if physically attached to the machine. So be warned, copy your activation key and save it somewhere that you can find it later if you need it!!

Yasmin
June 27, 2012 7:56 PM

I haven't installed the cd yet. So I can't retrieve it from the windows registry. I really need to have this serial code! I only have the disc and not the case it came in that had the serial code on it.

Mark J
June 28, 2012 12:38 AM

@Yasmine
Unless you have either the original case with the key or a working copy of Windows on your computer from which you can extract the key using Keyfinder, then it looks like there's no way you would be able to get the key.

Michael
July 14, 2012 7:07 AM

Are you crazy? Of course the product key is on the installation CD for Windows XP! Search for UNATTEND.txt (it's a hidden file). Its at the bottom of the text file.

My sanity might be questionable, but with respect to unattend.txt - most of the time the key you find there does not work. In a few cases it may. In many cases there is no unattend.txt. It all depends on how you got your copy of Windows and from whom.
product key
July 19, 2012 11:20 PM

how to find key from the cd of windows server 2008
plz can anybody help me

I'd recommend re-reading the article you just commented on. It addresses your question.
Ward
February 19, 2013 3:06 PM

Whenever I get a disc with a product key, I write the product key on the disk itself with a Sharpie indelible pen. That way if I have the disk, I have the key!!

Comments on this entry are closed.

If you have a question, start by using the search box up at the top of the page - there's a very good chance that your question has already been answered on Ask Leo!.

If you don't find your answer, head out to http://askleo.com/ask to ask your question.

Disk Utility User Guide

Disk On Key Formats

Disk Utility on Mac supports several file system formats:

  • Apple File System (APFS): The file system used by macOS 10.13 or later.

  • Mac OS Extended: The file system used by macOS 10.12 or earlier.

  • MS-DOS (FAT) and ExFAT: File systems that are compatible with Windows.

Apple File System (APFS)

Apple File System (APFS), the default file system for Mac computers using macOS 10.13 or later, features strong encryption, space sharing, snapshots, fast directory sizing, and improved file system fundamentals. While APFS is optimized for the Flash/SSD storage used in recent Mac computers, it can also be used with older systems with traditional hard disk drives (HDD) and external, direct-attached storage. macOS 10.13 or later supports APFS for both bootable and data volumes.

APFS allocates disk space within a container (partition) on demand. When a single APFS container has multiple volumes, the container's free space is shared and is automatically allocated to any of the individual volumes as needed. If desired, you can specify reserve and quota sizes for each volume. Each volume uses only part of the overall container, so the available space is the total size of the container, minus the size of all the volumes in the container.

Choose one of the following APFS formats for Mac computers using macOS 10.13 or later.

  • APFS: Uses the APFS format. Choose this option if you don't need an encrypted or case-sensitive format.

  • APFS (Encrypted): Uses the APFS format and encrypts the volume.

  • APFS (Case-sensitive): Uses the APFS format and is case-sensitive to file and folder names. For example, folders named 'Homework' and 'HOMEWORK' are two different folders.

  • APFS (Case-sensitive, Encrypted): Uses the APFS format, is case-sensitive to file and folder names, and encrypts the volume. For example, folders named 'Homework' and 'HOMEWORK' are two different folders.

You can easily add or delete volumes in APFS containers. Each volume within an APFS container can have its own APFS format—APFS, APFS (Encrypted), APFS (Case-sensitive), or APFS (Case-sensitive, Encrypted).

Mac OS Extended

Choose one of the following Mac OS Extended file system formats for compatibility with Mac computers using macOS 10.12 or earlier.

  • Mac OS Extended (Journaled): Uses the Mac format (Journaled HFS Plus) to protect the integrity of the hierarchical file system. Choose this option if you don't need an encrypted or case-sensitive format.

  • Mac OS Extended (Journaled, Encrypted): Uses the Mac format, requires a password, and encrypts the partition.

  • Mac OS Extended (Case-sensitive, Journaled): Uses the Mac format and is case-sensitive to folder names. For example, folders named 'Homework' and 'HOMEWORK' are two different folders.

  • Mac OS Extended (Case-sensitive, Journaled, Encrypted): Uses the Mac format, is case-sensitive to folder names, requires a password, and encrypts the partition.

Windows-compatible formats

Choose one of the following Windows-compatible file system formats if you are formatting a disk to use with Windows.

  • MS-DOS (FAT): Use for Windows volumes that are 32 GB or less.

  • ExFAT: Use for Windows volumes that are over 32 GB.

See alsoPartition schemes available in Disk Utility on MacAbout Disk Utility on Mac




broken image