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Programming
write() issue during a low level hdd access
Post 302397265 by sponnusa on Sunday 21st of February 2010 04:39:16 PM
02-21-2010
I wanted the write to fail only for the bad sectors, but it was failing for all the sectors in the O_DIRECT mode, but I got a working program. (Well, working means, I was able to write to the sectors, but still could not get it to fail for the bad sectors).
As i had updated in my previous post, i had created a small program which writes to the sectors with O_DIRECT. I guess i might have made some mistake in my original O_DIRECT try. (lets leave it apart!
)
But, even with the O_DIRECT and O_SYNC flags in place, the write passes for all the bad sectors.
Is there anything that has be enabled / checked?
Thank you for the replies.
As i had updated in my previous post, i had created a small program which writes to the sectors with O_DIRECT. I guess i might have made some mistake in my original O_DIRECT try. (lets leave it apart!
)But, even with the O_DIRECT and O_SYNC flags in place, the write passes for all the bad sectors.
Is there anything that has be enabled / checked?
Thank you for the replies.
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LEARN ABOUT BSD
disktab
DISKTAB(5) File Formats Manual DISKTAB(5) NAME
disktab - disk description file SYNOPSIS
#include <disktab.h> DESCRIPTION
Disktab is a simple date base which describes disk geometries and disk partition characteristics. The format is patterned after the term- cap(5) terminal data base. Entries in disktab consist of a number of `:' separated fields. The first entry for each disk gives the names which are known for the disk, separated by `|' characters. The last name given should be a long name fully identifying the disk. The following list indicates the normal values stored for each disk entry. Name Type Description ns num Number of sectors per track nt num Number of tracks per cylinder nc num Total number of cylinders on the disk b0 str Filename of block zero primary bootstrap for device ba num Block size for partition `a' (bytes) bd num Block size for partition `d' (bytes) be num Block size for partition `e' (bytes) bf num Block size for partition `f' (bytes) bg num Block size for partition `g' (bytes) bh num Block size for partition `h' (bytes) fa num Fragment size for partition `a' (bytes) fd num Fragment size for partition `d' (bytes) fe num Fragment size for partition `e' (bytes) ff num Fragment size for partition `f' (bytes) fg num Fragment size for partition `g' (bytes) fh num Fragment size for partition `h' (bytes) pa num Size of partition `a' in sectors pb num Size of partition `b' in sectors pc num Size of partition `c' in sectors pd num Size of partition `d' in sectors pe num Size of partition `e' in sectors pf num Size of partition `f' in sectors pg num Size of partition `g' in sectors ph num Size of partition `h' in sectors se num Sector size in bytes (default 512) sf bool supports bad144-style bad sector forwarding so bool partition offsets in sectors ty str Type of disk (e.g. removable, winchester) Disktab entries may be automatically generated with the diskpart program. FILES
/etc/disktab SEE ALSO
newfs(8), diskpart(8), getdiskbyname(3) BUGS
This file shouldn't exist, the information should be stored on each disk pack. 4.2 Berkeley Distribution May 17, 1986 DISKTAB(5)