On Mon, Nov 02, 2009 at 01:05:18PM +0100, Paolo Cavarretta wrote:
2009/10/31 Luca Berra <[email protected]>:
allora e' necessario stare attenti anche ai settori reallocati, perche'
questi
non vengono riscritti da un dd.
Il conto dei settori riallocati si ottiene con un interrogazione smart,
o con una mode page scsi che non ricordo piu'.
se i settori sono riallocati dal file system/OS perchè dd non dovrebbe
poterci scrivere sopra? tu alludi forse ad "aree" del disco non visibili
all'OS e gestite a più basso livello dal driver/controller, ma in tal caso
non si parla di settori reallocati...
alludo ad aree riallocate dal _DISCO_ non dal'OS (ovvio) ne dal
driver/controller (che non centra un accidente)
e, mi spiace di deluderti ma si tratta proprio di settori riallocati
http://en.wikipedia.org/wiki/S.M.A.R.T.
05 Reallocated Sectors Count
Count of reallocated sectors. When the hard drive finds a
read/write/verification error, it marks this sector as "reallocated" and
transfers data to a special reserved area (spare area). This process is
also known as remapping, and "reallocated" sectors are called remaps.
This is why, on modern hard disks, "bad blocks" cannot be found while
testing the surface - all bad blocks are hidden in reallocated sectors.
However, as the number of reallocated sectors increases, the read/write
speed tends to decrease. The raw value normally represents a count of
the number of bad sectors that have been found and remapped. Thus, the
higher the attribute value, the more sectors the drive has had to
reallocate.
L.
--
Luca Berra -- [email protected]
Communication Media & Services S.r.l.
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