Re: Grown defects bei IDE / ATAPI

* Bernd Walter <ticso(at)cicely12.cicely.de> [2003-09-01 17:48 +0200]:
> Moderne Platten können nämlich nur noch ganze Spuren schreiben.
> Der nicht mehr neu geschrieben Anteil der Spur ist verloren.
> Dann können sogar Blöcke draufgehen, die nicht verändert wurden.
> Beim Schreiben wird der Bereich halt einfach neu geschrieben und
> es gibt wieder eine gültige Prüfsumme.

http://docs.freebsd.org/cgi/getmsg.cgi?fetch=39285+0+archive/2003/freebsd-fs/20030202.freebsd-fs

Steve Byan <stephen_byan(at)maxtor.com>:
| On Friday, January 31, 2003, at 11:50 AM, phk(at)freebsd.org wrote:
[...]
| > It was my impression that already many drives write entire tracks
| > as atomic units, at least we have had plenty of anecdotal evidence
| > to this effect ?
|
| I'm not aware of any SCSI or ATA disks which do this; certainly no
| Maxtor disk does. Count-key-data mainframe disks can be formatted to do
| so, but such disks probably don't run Unix. Caching in ATA disks might
| lead one to believe that the disk could corrupt an entire track, in the
| sense that a panic ( aka bluescreen) or a power-failure would cause all
| pending writes in its buffer to be lost, but even in ATA-land I don't
| believe a power failure would result in more than one disk block
| returning an uncorrectable read error.

Nicolas

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Received on Mon 01 Sep 2003 - 18:33:53 CEST