On Wed, Mar 07, 2001 at 01:15:46PM -0800, Andre Hedrick wrote:
>
> Then run this and see if you live.
Well, I ran it, the disk lives. The typescript is appended below.
Interestingly, scsikiller didn't cream the partition table like I
expected. However the dd if=/dev/zero of=/dev/sdc certainly did.
I've been using dd to copy entire disks for 18 years. Not just SCSI,
but SMD, IPI and IDE. I've never had a problem with multi-sector writes
starting at any sector on drives. Unless there is a bug in the
drive's firmware, about the only thing you can do software wise to
a SCSI disk is to interrupt a format command, which can leave things
messed up a bit until the next format.
Script started on Wed Mar 7 14:55:00 2001
bells# fdisk /dev/sdc
Command (m for help): p
Disk /dev/sdc: 255 heads, 63 sectors, 553 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 553 4441941 83 Linux
Command (m for help): q
bells# dd if=/dev/sdc of=sdc.part bs=512 count=1
1+0 records in
1+0 records out
bells# cat scsikiller.c
/* scsikiller.c */
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <scsi/scsi.h>
struct cdb6hdr{
unsigned int inbufsize;
unsigned int outbufsize;
unsigned char cdb [6];
} __attribute__ ((packed));
int main (int argv, char **argc)
{
int fd;
unsigned char tBuf[526];
struct cdb6hdr *ioctlhdr;
if (argv != 2) exit(-1);
fd = open (*(argc+1), O_RDWR );
if (fd < 0) exit (-1);
memset(&tBuf, 0, 526);
ioctlhdr = (struct cdb6hdr *) &tBuf;
ioctlhdr->inbufsize = 512;
ioctlhdr->outbufsize = 0;
ioctlhdr->cdb[0] = WRITE_6;
ioctlhdr->cdb[4] = 1;
return ioctl(fd, 1, &tBuf);
}
bells# cc -o scsikiller scsikiller.c
bells# scsikiller /dev/sdc
bells# dd if=/dev/sdc of=/dev/null bs=512 count=100
100+0 records in
100+0 records out
bells# fdisk /dev/sdc
Command (m for help): p
Disk /dev/sdc: 255 heads, 63 sectors, 553 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 553 4441941 83 Linux
Command (m for help): q
bells# dd if=sdc.part of=/dev/sdc
1+0 records in
1+0 records out
bells# dd if=/dev/sdc of=/dev/null bs=512 count=100
100+0 records in
100+0 records out
bells# dd if=/dev/zero of=/dev/sc bs=512 count=100
100+0 records in
100+0 records out
bells# fdisk /dev/sdc
Device contains neither a valid DOS partition table, nor Sun or SGI disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
Command (m for help): q
bells# dd if=sdc.part of=/dev/sdc
1+0 records in
1+0 records out
bells# fdisk /dev/sdc
Command (m for help): p
Disk /dev/sdc: 255 heads, 63 sectors, 553 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 553 4441941 83 Linux
Command (m for help): q
bells# ^Dexit
Script done on Wed Mar 7 14:57:35 2001
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This archive was generated by hypermail 2b29 : Wed Mar 07 2001 - 21:00:24 EST