10-10-2002
yls177, experts can often recover some data from deleted files. And it's very hard to completely destroy the data to the point that an expert can recover nothing. There are even commericial companies that offer services like recovering deleted data. A disk is especially hard to wipe clean. When a sector has problems, it is replaced by another sector. This may happen inside the drive and be transparent to the driver. That sector that was taken out of service may still have data and an expert can find a way to read it.
So if you have old disks with classified data on them, destroy them. If you follow janr's advice and tell your Security Officer "Hey don't worry about those old disks, I ran fdisk on them before I sold them on EBAY!", you could literally find yourself behind bars.
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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)