Sudden disk0s3 volume

Discussion in 'Windows, Linux & Others on the Mac' started by Trainwreck707, Sep 1, 2008.

  1. Trainwreck707 macrumors member

    Feb 26, 2008
    I have a 2008 Mac Pro with separate internal HD's for Mac & Windows. While formatting a third internal I noticed that my main HD now has a partition titled "disk0s3." It is 128 MB and says the type is Microsoft Reserved. I did not use BootCamp to install Windows and do not have a Windows partition on my main HD so I am wondering what this is and where it came from.

    Does anyone else that boots windows from a separate HD have this partition? Could it have come from one of the system updates? What would happen if I deleted it? It is tiny so I am not too concerned—just wondering why it's there.
  2. chscag macrumors 68030


    Feb 17, 2008
    Fort Worth, Texas
    Don't delete it. I'm thinking it's a pointer that may be required so you can boot from your Windows only hard drive. All versions of Windows like to be on the master HD in the first primary bootable partition. There's various ways of fooling it to boot from a slave HD or even from a second or third primary partition. That small 128 MB partition might be needed for doing that.

  3. Neil321 macrumors 68040


    Nov 6, 2007
    Britain, Avatar Created By Bartelby
    Sounds like your swap partition (EFI) although their normally 200mb,anyways i'd leave it alone
  4. Trainwreck707 thread starter macrumors member

    Feb 26, 2008
    Thanks—I won't delete it. It's just strange that I didn't notice it before. I've been dual booting for a few months and don't recall it being there.
  5. Dragonforce macrumors 6502a


    Apr 9, 2008
    London (Ealing) UK
    I have the disk0s3 128 MB "Microsoft Reserved" partition on my start volume as well... I don't remember who or what created it... I'm booting Windows from the HDD in bay 2 (Mac Pro)

    Does anyone know what exactly it is ?

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