separate partition for VMs?

Discussion in 'Virtual PC' started by Timothy Daniels, Feb 21, 2008.

  1. It isn't the capacity of the device (FAT32 supports up to 137GB drives) but
    the FILESIZE limitation. No one file can exceed 4GB. That is the rub with
    a vm. Except for legacy OSs like Win98, a 4GB .vhd file is not generally
    useful. It is impossible for a Vista vm.

    Colin Barnhorst, Feb 23, 2008
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  2. Never ever say that! First of all, your English is fine.
    Secondly, only non-native English speakers say that.
    Native English speakers (and immigrants) just fracture
    the language without apology. :) So if you want to be
    accepted as a native English speaker, just use terrible
    English and sound like you never went to school. These
    newsgroups are an excellent tutorial for that. :)

    Timothy Daniels, Feb 23, 2008
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  3. Timothy Daniels

    Robert Comer Guest

    You can format pen drives with NTFS to get by the 4G size limitation.

    Bob Comer

    Robert Comer, Feb 23, 2008
  4. Timothy Daniels

    Robert Comer Guest

    I guess... but it works... Maybe some benchmark could be used to determine
    It is a little slower, but it is also safer.
    Yes it can, a *lot* more actually, but file size are still limited to

    Bob Comer

    Robert Comer, Feb 23, 2008
  5. Timothy Daniels

    Vincent Guest

    I got it... We need more than 4Gb to hold (at least) a VHD file into the
    fat32-pen drive... That's why it wouldn't work on FAT32... isn't it? 'cause
    its limit is 4gb filesize...

    In a FAT32 pendrives I used up to 3gb files... so I never deal with that
    problem. But it's good to know... thanks

    Vincent, Feb 23, 2008
  6. That's the main reason. Mark is pointing out additional considerations, but
    the main thing is the size of .vhd files for vms running current Windows
    operating system versus FAT32s filesize limit.

    Colin Barnhorst, Feb 23, 2008
  7. Timothy Daniels

    Vincent Guest

    Oh... good to know...

    So, VPC do run fine on FAT32 with this scheme of multi-files... I think if
    one of those files became corrupt or are accidentally erased that could
    cause the virtual machine to hang up.... ??

    I never turn off the virtual machine. Instead I save the state and the next
    time I want to use the virtual machine I get to the same state... Once I
    did a very stupid action... I share the disk (VHD) between two virtual
    machines.... only one running at a time... all went fine until I just save
    the state (Don't ask why I wanted to do this ;)) When I save the state on
    the first machine and made changes on the second virtual machine, the disk
    got corrupted.... Yeah... I didn't notice until I tried to open an old
    database.... data dissapeared.... Panic! yes... I figure out that the first
    virtual machine had the FAT map ok when it was running.... and the next time
    that machine was restored it still has the FAT map in memory, but the disk
    was modified by the seconrd virtul machine.... so the real fAT map was
    changed... the first virtual machine has no idea and any change to the disk
    was written accordingly the old FAT map... resulting in a real mess.... I
    had a back up of the VHD ;)
    Vincent, Feb 24, 2008
  8. Timothy Daniels

    Paul Adare Guest

    This isn't the case at all. There's nothing preventing one from formatting
    or converting a thumb drive to NTFS which eliminates the 4 GB barrier. No
    need to wait for ExFat. The other problem with thumb drives potentially is
    sustained write speeds just aren't very good. Burst may be fine, sustained
    tends to suck.

    Paul Adare
    MVP - Virtual Machines
    %Disclaimer: Any errors in spelling, tact, or fact are transmission
    Paul Adare, Feb 24, 2008
  9. Timothy Daniels

    Paul Adare Guest

    As posted else where in this thread, this simply isn't the case. There's
    always NTFS.
    Paul Adare, Feb 24, 2008
  10. Timothy Daniels

    Paul Adare Guest

    What overhead?
    Paul Adare, Feb 24, 2008
  11. Timothy Daniels

    Vincent Guest

    What's sustained write speed? and the burst write speed?
    Vincent, Feb 25, 2008
  12. Timothy Daniels

    Vincent Guest

    USB drives use a "journaling" file system... JFFS ... I do not know
    where... but I heard something like that... Does it add some overhead too?
    Vincent, Feb 25, 2008
  13. Timothy Daniels

    Paul Adare Guest

    NTFS is a journaling file system. There's no such thing as a file system
    called JFFS at least not one that Windows can use.
    Paul Adare, Feb 25, 2008
  14. Timothy Daniels

    Vincent Guest

    I read... Journaling Flash File System... It's supposed to be used in flash
    drives... But... I'm a little confused.... As you said NTFS is a journaling
    file system... So, Is that the file system (JFFS) that is refered to when
    talking about usb drives? or.... is some low-level file system (if such
    thing exist) and... Does JFFS exist even when pen drives are formatted
    with FAT32?

    Well, yes, windows use NTFS or FAT32... but where do this JFFS fit in the
    scheme....? It's related to Flash drives.... the only thing I'm sure of...

    Could it be that the file system USB drives use is some like a virtual file
    system... Maybe it report like FAT32 or NTFS but underlying there is another
    file system? (Yeah I have no idea what I'm talking about... just a
    philisiphical question...)

    I read you, please don't get mad. NTFS is a journaling file system; I assume
    tha FAT32 isn't a journaling file system.... I'm just still confused...

    Vincent, Feb 25, 2008

    Colin Barnhorst, Feb 25, 2008
  16. Timothy Daniels

    Robert Comer Guest

    JFFS is a Linux file system for flash drives, kind of equivalent to

    FAT32, or just plain FAT are not journaling files systems as you
    Robert Comer, Feb 25, 2008
  17. Timothy Daniels

    Vincent Guest


    Vincent, Feb 26, 2008
  18. Timothy Daniels

    Robert Comer Guest

    Glad to help. I didn't really know about it to begin with either, but
    you got me curious about it...
    Robert Comer, Feb 26, 2008
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