Blank check on WORM media

Resolving The Problem

The following details on blank check with optical media has been provided by the developers of the optical devices:

"A blank check is sense 08 93 00. It is used with WORM (or CCW) media and indicates that the sector has not yet been written. Depending on the scenario it may be normal or may indicate an error. When the file system code is finding out where to write the next block of data it will take a specified starting point on the media and then do a SCAN MEDIUM command to find the first blank sector. The drive will report blank check to indicate a blank was found, and will return the location of the blank. Then the file system starts writing the data at this blank sector. So in this scenario the blank check is normal. However if the file system goes to READ a sector that it believes is written already (as it would when it reads a previously written file at the location specified in the directory info) and encounters a blank check it means there is a mismatch between the directory info and what is actually on the disk. Causes could be a bug in the file system code (such as writing a directory entry even though the data had not been written correctly) or maybe the drive was not really at the correct location when it tried to write or read the sector."