Messages in this thread | | | Date | Mon, 16 May 2005 10:33:30 -0400 | From | Jeff Garzik <> | Subject | Re: Disk write cache (Was: Hyper-Threading Vulnerability) |
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Matthias Andree wrote: > On Sun, 15 May 2005, Mikulas Patocka wrote: > > >>Note that disk can still ignore FLUSH CACHE command cached data are small >>enough to be written on power loss, so small FLUSH CACHE time doesn't >>prove disk cheating. > > > Have you seen a drive yet that writes back blocks after power loss? > > I have heard rumors about this, but all OEM manuals I looked at for > drives I bought or recommended simply stated that the block currently > being written at power loss can become damaged (with write cache off), > and that the drive can lose the full write cache at power loss (with > write cache on) so this looks like daydreaming manifested as rumor.
Upon power loss, at least one ATA vendor's disks try to write out as much data as possible.
Jeff
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