On Friday 09 June 2006 03:11, Ulrich Spoerlein wrote: > I have an external HDD that I initially attached via Firewire, but I've > since switched to USB, as our firewire subsystem is less than rock Interesting. I find the reverse :) Then again I started using Firewire in 4.x where USB2.0 didn't exist and the USB 1 code was kind of dodgy. > The question really is, are 512 byte disk writes considered to be some > kind of "atomic" as it is the smallest disk block size? What does the > ATA subsystem do with writes of 4096? Are they completed atomically too, > or not? I think that in reality with a modern high capacity disk you don't get atomic writes at all because they all re-write whole tracks. Yes this violates the assumption soft updates makes, I believe the only way around it is to buy SCSI drives (not because they're SCSI per se, but because they're smaller capacity so they don't do this) -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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