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Erasing hard disk contents using dd or dcfldd
06-05-2009
That helped. So I am guessing writing to the device file for the HDD, opened with (O_SYNC) coupled with an extra sync command and a sleep, between the 2 swipes should be enough to ensure what I am asking to be written to disk actually does get there.|
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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)