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Full Discussion: SCSI disk spare sectors
Special Forums Hardware Filesystems, Disks and Memory SCSI disk spare sectors Post 302151845 by rednex on Monday 17th of December 2007 03:12:05 PM
Old 12-17-2007
I am sorry. I think I confused everyone. This is what I actually meant to say..

Usually a hard disk keeps spare sectors that are not visible to the user. Whenever the disk encounters a bad block the disk internally replaces these bad blocks from the spare sectors. This operation is completely translucent to the user. There seems to be a specific number of spare sectors on any hard disk that is used for recovering from bad blocks. But once the disk runs out of spare sectors in the process of replacing bad blocks, all future bad blocks will become medium errors (unrecoverable). If the number of available spare sectors can be found then the user can be informed much earlier that its time to backup this disk as it would soon become faulty.
 

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LEARN ABOUT NETBSD

newfs_sysvbfs

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

NAME

     newfs_sysvbfs -- construct a new System V Boot File System

SYNOPSIS

     newfs_sysvbfs [-FZ] [-s sectors] special

DESCRIPTION

     newfs_sysvbfs builds a System V boot file system on the specified special.  If it is a device, the size information will be taken from the
     disk label and before running newfs_sysvbfs the disk must be labeled using disklabel(8); the proper fstype is ``SysVBFS''.  Otherwise, the
     size must be specified on the command line.

     The following arguments are supported:

     -F 	 Create file system to a regular file.

     -s sectors  Create file system with specified number of disk sectors.

     -Z 	 Fill file with zeroes instead of creating a sparse file.

SEE ALSO

     disklabel(5), disktab(5), disklabel(8), diskpart(8)

HISTORY

     A newfs_sysvbfs command first appeared in NetBSD 4.0.

BUGS

     The sysvbfs support is still experimental and there are few sanity checks.

BSD
								   April 9, 2009							       BSD
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