addbadsec(1M)
NAME
addbadsec - map out defective disk blocks
SYNOPSIS
addbadsec [-p] [ -a blkno [blkno...]] [-f filename]
raw_device
DESCRIPTION
addbadsec is used by the system administrator to map out bad
disk blocks. Normally, these blocks are identified during
surface analysis, but occasionally the disk subsystem
reports unrecoverable data errors indicating a bad block. A
block number reported in this way can be fed directly into
addbadsec, and the block will be remapped. addbadsec will
first attempt hardware remapping. This is supported on SCSI
drives and takes place at the disk hardware level. If the
target is an IDE drive, then software remapping is used. In
order for software remapping to succeed, the partition must
contain an alternate slice and there must be room in this
slice to perform the mapping.
It should be understood that bad blocks lead to data loss.
Remapping a defective block does not repair a damaged file.
If a bad block occurs to a disk-resident file system struc-
ture such as a superblock, the entire slice might have to be
recovered from a backup.
OPTIONS
The following options are supported:
-a Adds the specified blocks to the hardware or software
map. If more than one block number is specified, the
entire list should be quoted and block numbers should
be separated by white space.
-f Adds the specified blocks to the hardware or software
map. The bad blocks are listed, one per line, in the
specified file.
-p Causes addbadsec to print the current software map.
The output shows the defective block and the assigned
alternate. This option cannot be used to print the
hardware map.
OPERANDS
The following operand is supported:
raw_device
The address of the disk drive (see FILES).
FILES
The raw device should be /dev/rdsk/c?[t?]d?p0. See disks(1M)
for an explanation of SCSI and IDE device naming conven-
tions.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Architecture | x86 |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
disks(1M), diskscan(1M), fdisk(1M), fmthard(1M), format(1M),
attributes(5)
NOTES
The format(1M) utility is available to format, label,
analyze, and repair SCSI disks. This utility is included
with the addbadsec, diskscan(1M), fdisk(1M), and fmthard(1M)
commands available for x86. To format an IDE disk, use the
DOS "format" utility; however, to label, analyze, or repair
IDE disks on x86 systems, use the Solaris format(1M) util-
ity.
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