Primary disk as scratch disk. Dropped frames?

Discussion in 'Digital Video' started by PkennethV, Mar 9, 2007.

  1. PkennethV macrumors 6502a

    Joined:
    Aug 16, 2006
    Location:
    Toronto
    #1
    I was watching some training for FCP on Lynda.com and the trainer made it clear that he did not want us to use the boot disk as a scratch disk (not even a partition). One reason is that the bandwidth from a single drive is not enough, causing it to run slower, but he also mentions that it will almost always cause dropped frames (not just while editing-it will also so in output). If that is so then why are so many pros on Apple's site saying that they finally have the power to edit movies (FCP I would assume) on the go. I'm sure pros wouldn't want dropped frames in their movies.
     
  2. bigbossbmb macrumors 68000

    bigbossbmb

    Joined:
    Jul 1, 2004
    Location:
    Pasadena/Hollywood
    #2
    cuz they bring a FW drive with them...

    when they say they are editing 'on the go' they really mean that they can go somewhere else, sit down with a laptop and an external drive, and edit. they are not talking about editing on a bus or in a car.
     
  3. PkennethV thread starter macrumors 6502a

    Joined:
    Aug 16, 2006
    Location:
    Toronto
    #3
    Right, I forgot about bus powered drives:eek:
     
  4. mkaake macrumors 65816

    Joined:
    Apr 10, 2003
    Location:
    mi
    #4
    I don't do anything hardcore, but I've never dropped frames capturing to my primary drive.

    That said, giving as much bandwidth as possible at any given time is the best thing you can do...
     
  5. bigbossbmb macrumors 68000

    bigbossbmb

    Joined:
    Jul 1, 2004
    Location:
    Pasadena/Hollywood
    #5
    i wasn't talking about bus powered drives... those are not very fast (usually small laptop drives). I was talking about 3.5" 7200 RPM drives. When they are 'editing on the go' it is them sitting down somewhere, hooking up their laptop and hard drives, and going to work.
     
  6. hoop macrumors member

    Joined:
    Jan 2, 2007
    Location:
    Bath, yookay.
    #6
    Sounds like false information to me. I use my primary disks all the time without any problems.
     
  7. killr_b macrumors 6502a

    killr_b

    Joined:
    Oct 21, 2005
    Location:
    Suckerfornia
    #7
    Yeeaahh… you see, the FCP manual says not to capture to your system drive. But the iMovie manual doesn't.
     
  8. hoop macrumors member

    Joined:
    Jan 2, 2007
    Location:
    Bath, yookay.
    #8
    Well, if anything this thread has given me an excuse to fork out for another HDD :)
     
  9. P-Worm macrumors 68020

    P-Worm

    Joined:
    Jul 16, 2002
    Location:
    Salt Lake City, UT
    #9
    If it means anything, I had LOADS of dropped frames until I got a second internal hard drive in my Mac Pro.

    P-Worm
     
  10. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #10
    When you have your data and your scratch on the same physical drive, the head is forced to repetively transit back and forth between the data area and the scratch area, and the time requried to do this adds to the latency of the whole system. At some point it falls over and starts dropping frames.

    Here's a way to test it. Take a large folder, and Duplicate it on your hard drive (or copy it to a different partition) Time how long it takes. Now take the same folder, and copy it to a different hard drive. It'll take almost half the time - because the destination drive can write continuously and the source drive can read contiuously, without shuttling the heads back and forth.

    You can also understand from this why putting the scratch on a different partition on the same drive is ineffective -- its the same physical head transiting back and forth, even in it is n different logocal partitions on the drive.

    So: Dividing highly alternating tasks between different physical drives is a primary strategy for improving performance, moreso than RAID or any other strategy.
     
  11. sturigdson macrumors regular

    Joined:
    Apr 3, 2006
    #11
    Not to mention that this constant degree of physical work on the heads and disks themselves increases the odds of physical malfunction and wear, and, in my experience, opens your primary drive to all sorts of other file corruptions in the system.
     
  12. Father Jack macrumors 68020

    Father Jack

    Joined:
    Jan 1, 2007
    Location:
    Ireland
    #12
    If you can, use a different hard drive as the scratch disk. It is more efficient for Photoshop and Final Cut.

    FJ
     
  13. poppe macrumors 68020

    poppe

    Joined:
    Apr 29, 2006
    Location:
    Woodland Hills
    #13
    so thats why i got dropped frames!!!! man i even posted for help awhile back and got no answer, so had to use a PC with Avid because I couldn't find the solution... (good ole manuals...)
     
  14. evil_santa macrumors 6502a

    evil_santa

    Joined:
    Sep 23, 2003
    Location:
    London, England
    #14
    I use my MacBook & a Lacie FW pocketdrive to edit with on my Train journy into work :D the only down side is its a bit hard on the batterys.

    Works ok, but im not runnig full DV
     

Share This Page