10-12-2011
First off, understand that modern hard drives ("modern" as in "last 15-25 years") have bad-sector remapping. When they spot a sector going bad, they take its contents and put it in a 'spare' location without telling you. So: your hard drive doesn't have a bad sector.
It has so many bad sectors that it's run out of spares. That could be a quarter of the drive or more, gone bad. This drive is not safe to use. Get your data off and stop using it before it betrays you.
You can't low-level format anymore. The densities they have these days, they only have the precision to do that at the factory. Dead sectors are dead for keeps.
A 'sector' is just a collection of zeroes and ones, there's not a magic combo of 512 bytes that makes a sector go bad. dd_rescue is safe. bad sectors can't be transferred. dd_rescue can't even read them, it fills in zeroes and skips.
Did you dd the entire disk, or just the partition?
Last edited by Corona688; 10-12-2011 at 07:35 PM..
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hdio(7I) Ioctl Requests hdio(7I)
NAME
hdio - SMD and IPI disk control operations
SYNOPSIS
#include <sys/hdio.h>
DESCRIPTION
Note - The SMC and IPI drivers have been discontinued. dkio(7I) is now the preferred method for retrieving disk information.
The SMD and IPI disk drivers supplied with this release support a set of ioctl(2) requests for diagnostics and bad sector information.
Basic to these ioctl() requests are the definitions in <sys/hdio.h>.
IOCTLS
HDKIOCGTYPE The argument is a pointer to a hdk_type structure (described below). This ioctl() gets specific information from the hard
disk.
HDKIOCSTYPE The argument is a pointer to a hdk_type structure (described below). This ioctl() sets specific information about the hard
disk.
/*
* Used for drive info
*/
struct hdk_type {
ushort_t hdkt_hsect; /* hard sector count (read only) */
ushort_t hdkt_promrev; /* prom revision (read only) */
uchar_t hdkt_drtype; /* drive type (ctlr specific) */
uchar_t hdkt_drstat; /* drive status (ctlr specific, ro) */
};
HDKIOCGBAD The argument is a pointer to a hdk_badmap structure (described below). This ioctl() is used to get the bad sector map from
the disk.
HDKIOCSBAD The argument is a pointer to a hdk_badmap structure (described below). This ioctl() is used to set the bad sector map on
the disk.
/*
* Used for bad sector map
*/
struct hdk_badmap {
caddr_t hdkb_bufaddr; /* address of user's map buffer */
};
HDKIOCGDIAG The argument is a pointer to a hdk_diag structure (described below). This ioctl() gets the most recent command that failed
along with the sector and error number from the hard disk.
/*
* Used for disk diagnostics
*/
struct hdk_diag {
ushort_t hdkd_errcmd; /* most recent command in error */
daddr_t hdkd_errsect; /* most recent sector in error */
uchar_t hdkd_errno; /* most recent error number */
uchar_t hdkd_severe; /* severity of most recent error */
};
SEE ALSO
ioctl(2), dkio(7I)
SunOS 5.10 13 Aug 2002 hdio(7I)