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CF v HDD

Discussion in 'Electronic Design' started by Dirk Bruere at NeoPax, Mar 5, 2010.

  1. JosephKK

    JosephKK Guest

    Under normal situations (where hardware handles talking to the CF device)
    it should boot faster, as the sustained read rate is better and the seek
    time is much lower [no physical movement]).
     
  2. Martin Brown

    Martin Brown Guest

    If you want to do the practical experiment most PCs can be persuaded to
    boot directly from CF media. Dedicated SSD is faster still and becoming
    increasingly affordable. They are silent in operation. Very useful if
    you have huge multi-GB files requiring random readonly access.

    Another quick and dirty test would be to put in a fast USB thumbnail
    drive and let Vista put the fast boot image on it.

    Regards,
    Martin Brown
     
  3. No way am I getting near Vista!
    Anyhow, I only need to boot about 3GB
    Either embedded XP or Linux

    I'll try the USB flash expt though, since I've downloaded the netbook
    version of Ubuntu which is designed to run from flash.

    --
    Dirk

    http://www.transcendence.me.uk/ - Transcendence UK
    http://www.theconsensus.org/ - A UK political party
    http://www.blogtalkradio.com/onetribe - Occult Talk Show
     
  4. Nico Coesel

    Nico Coesel Guest

    I have put a 133x CF into a logic analyzer and it works fine. I notice
    no speed degradation. At least the ratling noise is gone.
     
  5. Nico Coesel

    Nico Coesel Guest

    Just one note though: Windows probably sees the CF as a removable
    device. Not all software allows itself to be installed on a removable
    device (thats yet another stupid microsoft-ism).
     
  6. JW

    JW Guest

    That's why they make fixed-disk compact flash.
     
  7. Anssi Saari

    Anssi Saari Guest

    Not if it's connected via an IDE adapter, then it just looks like an
    old fashioned IDE drive with no removability. CF provides that mode,
    so the adapter is just mechanics.

    The compatibility thing is a cool thing for some old electronics that
    has hard drives and won't accept larger drives. Larger than 504 MB or
    thereabouts, that is.
     
  8. Nico Coesel

    Nico Coesel Guest

    I did that and Windows still sees it as a removable disk. It has to do
    with some bits in the identification.
     
  9. I'll let people here know when I have done it, although from reading the
    instructions on the Ubuntu site it seems very straightforward.
    http://www.ubuntu.com/getubuntu/download-netbook

    If you do it before me post how it went please.

    --
    Dirk

    http://www.transcendence.me.uk/ - Transcendence UK
    http://www.theconsensus.org/ - A UK political party
    http://www.blogtalkradio.com/onetribe - Occult Talk Show
     
  10. Rich Webb

    Rich Webb Guest

    This is where I started when CF-ifying XPe for a piece of gear.
    <http://versalogic.com/kb/KB.asp?KBI...archType=All&KBCatID=0&submit1=++++Search++++>

    Why do "webmasters" insist on links like that? If it's broken, hop over
    to http://versalogic.com/index.asp and search their knowledge base for
    "compact flash".

    We used one of their PC/104+ processor boards; I'd guess that other
    PC/104 vendors would have similar info. Long story short: almost all CF
    modules are used in consumer video gear and the like as recording media,
    where the ability to boot isn't needed and adds cost. So, away it goes.
     
  11. Nico Coesel

    Nico Coesel Guest

    Booting is not the real problem. The problem is that some installers
    don't want to install to a removable disk.
     
  12. JosephKK

    JosephKK Guest

  13. Well, if my apps work on it I'll just load them up and never touch the
    thing again. If it ain't broke I won't be fixing it.
     
  14. Guest

    Guest Guest

    Most CF vendors will provide you with an app which changes the
    removable/non-removable flag on the card. We use SanDisk and they were
    very helpful with this in spite of the low volumes. They also sell
    industrial-grade CF cards with the flag already set (amongst other
    differences - longer guaranteed retention etc)

    The other reason for marking the card as non-removable is AFAIK you
    can't partition a removable drive using fdisk etc.

    HTH
     
  15. JosephKK

    JosephKK Guest

    I have formatted removable drives and (HD like) media from both MSwin
    and Linux. QED it is doable. Depending on the media you may have
    to jump though some extra hoops. Also have done DVD-RAM, i have media
    so why not?
     
  16. Guest

    Guest Guest

    What tools did you use? We tried DOS FDISK and Norton GDISK under
    MSDOS, both won't partition the card until it has had the removable flag
    set.

    This was for a bootable CD-ROM which partitions the card, then loads the
    OS and apps onto the card from a Norton Ghost image on the CD.
    There are probably better ways of doing this, but it worked for us at
    the time.
     
  17. JosephKK

    JosephKK Guest

    I used parted from Linux. This was for a removable media hard disk, and
    USB / firewire disconnectable volumes (includes flash); but not a memory card.
     
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