badsect man page on OSF1

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badsect(8)							    badsect(8)

NAME
       badsect - Creates files to contain bad sectors

SYNOPSIS
       /usr/sbin/badsect bbdir sector...

DESCRIPTION
       The  badsect  command  makes a file to contain a bad sector.  Normally,
       bad sectors are made inaccessible by the standard formatter, which pro‐
       vides  a	 forwarding  table  for bad sectors to the driver. If a driver
       supports the bad blocking standard, it is preferable to use that method
       to  isolate  bad blocks because the bad block forwarding makes the disk
       appear perfect, and such disks can then be copied with dd(1). The tech‐
       nique  used  by badsect is also less general than bad block forwarding,
       as badsect cannot make amends for bad blocks in the i-list of file sys‐
       tems or in swap areas.

       On  some	 disks, adding a sector that is suddenly bad to the bad sector
       table currently requires the running of the standard formatter.	 Thus,
       to  deal	 with  a  newly bad block or on disks where the drivers do not
       support the bad-blocking standard, badsect can be used to good effect.

       Use the badsect command on a quiet file system in  the  following  way:
       Mount  the file system and change to its root directory.	 Make a direc‐
       tory BAD there.	Run badsect, giving as argument the BAD directory fol‐
       lowed by all the bad sectors you wish to add.  (The sector numbers must
       be relative to the beginning of the file system, as reported in console
       error  messages.)   Change back to the root directory, unmount the file
       system, and run fsck(8) on the file system.   The  bad  sectors	should
       show  up	 in  two  files	 or in the bad sector files and the free list.
       Have fsck remove files containing the offending bad sectors, but do not
       have  it remove the BAD/nnnnn files.  This operation will leave the bad
       sectors in only the BAD files.

       The badsect command works by giving the specified sector numbers	 in  a
       mknod(2)	 system	 call,	creating  an  illegal  file  whose first block
       address is the block containing bad sector and whose name  is  the  bad
       sector  number.	 When  fsck  discovers the file, it will ask “HOLD BAD
       BLOCK?”	An affirmative response will cause fsck to convert  the	 inode
       to a regular file containing the bad block.

RESTRICTIONS
       If more than one of the sectors comprised by a file system fragment are
       bad, you should specify only one to badsect, as the blocks in  the  bad
       sector files cover all the sectors in a file system fragment.

ERRORS
       The  badsect command refuses to attach a block that resides in a criti‐
       cal area or is out of range of the file system.	A warning is issued if
       the block is already in use.

SEE ALSO
       Commands: fsck(8)

								    badsect(8)
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