Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

diskchec(1) [minix man page]

DISKCHECK(1)						      General Commands Manual						      DISKCHECK(1)

diskcheck - check a disk for bad sectors SYNOPSIS
diskcheck device start count EXAMPLES
diskcheck /dev/at0 0 1200 # Check 1.2 MB diskette diskcheck /dev/at0 100 50 # Check blocks 100 to 149 DESCRIPTION
Diskcheck checks a disk for bad sectors by reading in each sector, writing a known bit pattern onto it, reading it back in and comparing with what was written. This check is then done a second time. Bad sectors are reported. After each sector is tested, the original sector is restored. Only use this program on unmounted partitions. Killing it part way through may result in lost data. SEE ALSO
format(1). DISKCHECK(1)

Check Out this Related Man Page

BADSECT(8)						    BSD System Manager's Manual 						BADSECT(8)

badsect -- create files to contain bad sectors SYNOPSIS
badsect bbdir sector ... DESCRIPTION
The badsect utility 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 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 dd(1). The technique used by this program is also less general than bad block forwarding, as badsect cannot 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 badsect may be used to good effect. The badsect utility is used on a quiet file system in the following way: First mount the file system, and change to its root directory. Make a directory BAD there. Run badsect giving as argument the BAD directory followed by all the bad sectors you wish to add. (The sector num- bers must be relative 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 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(8) 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 badsect utility 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 it is discovered by fsck(8) it will ask ``HOLD BAD BLOCK ?''. A positive response will cause fsck(8) to convert the inode to a regular file containing the bad block. DIAGNOSTICS
The badsect utility 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
fsck(8) HISTORY
The badsect utility appeared in 4.1BSD. BUGS
If more than one sector which comprise a file system fragment are bad, you should specify only one of them to badsect, as the blocks in the bad sector files actually cover all the sectors in a file system fragment. BSD
June 5, 1993 BSD
Man Page

We Also Found This Discussion For You

1. Shell Programming and Scripting

Mail sent from variable is not aligned in shell script

Hi Folks :( Scenario, Compared two values in two different files, if file1 value is greater than the value of file2 it trigger mail, I tried this, echo ${usep}; echo ${usep1}; for i in ${!usep}; do if } -gt 80 ]; then if } -gt ${usep1} ]; then ... (9 Replies)
Discussion started by: viay
9 Replies

Featured Tech Videos