badsect man page on Ultrix

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badsect(8)							    badsect(8)

Name
       badsect - create files to contain bad sectors

Syntax
       /etc/badsect bbdir sector ...

Description
       The  command  makes a file to contain a bad sector.  Normally, bad sec‐
       tors are made inaccessible by the standard formatter, which provides  a
       forwarding  table  for bad sectors to the driver.  For further informa‐
       tion, see If a driver supports the bad blocking	standard  it  is  much
       preferable  to  use  that  method  to isolate bad blocks, since the bad
       block forwarding makes the pack appear perfect, and such packs can then
       be  copied with The technique used by this program is also less general
       than bad block forwarding, as can't make amends for bad blocks  in  the
       i-list of file systems or in swap areas.

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

       The command is used on a quiet file system in the following way:	 First
       mount the file system, and change to its root directory.	 Make a direc‐
       tory BAD there.	Run giving as argument the BAD directory  followed  by
       all the bad sectors you wish to add.  (The sector numbers must be rela‐
       tive to the beginning of the file system, but this is not hard  as  the
       system  reports relative sector numbers in its console error messages.)
       Then change back to the root directory, unmount the file system and run
       on  the file system.  The bad sectors should show up in two files or in
       the bad sector files and the free list.	Have remove  files  containing
       the  offending  bad  sectors,  but  do not have it remove the BAD/nnnnn
       files.  This will leave the bad sectors in only the BAD files.

       The command works by giving the specified sector numbers	 in  a	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 it
       is  discovered  by it will ask ``HOLD BAD BLOCK''?  A positive response
       will cause to convert the inode to a regular file  containing  the  bad
       block.

Restrictions
       If  more	 than one sector that comprises a file system fragment is bad,
       you should specify only one to as the blocks in the  bad	 sector	 files
       cover all the sectors in a file system fragment.

Diagnostics
       The  command  refuses to attach a block that resides in a critical area
       or is out of range of the file system.  A  warning  is  issued  if  the
       block is already in use.

See Also
       bad144(8), format(8v), fsck(8)

				      VAX			    badsect(8)
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