Grass Valley PDR v.2.1 - Manual (Page 128)

Chapter 4 Using the Profile Disk Utility
112 Profile Family
Relocating and Testing Bad Blocks
The reason why bad block errors are reported is usually not because the
physical block (cluster) is damaged. Often the reason is because when the
system attempts to read a media file and for any reason it cannot read a block,
it does not retry but simply repeats the last field and moves on to the next block.
NOTE: The following tests are nondestructive.
To relocate bad blocks:
• Choose Disk Utilities | Relocate Bad Blocks or click Relocate Bad
Clocks.
Testing bad blocks determines whether a bad block error is really a physical
problem with the disk or just a nonrepeatable read error that can be ignored. If
the error is nonrepeatable, the block may be removed from the bad blocks list.
Otherwise, the block will be reallocated.
To test bad blocks:
• Choose Disk Utilities | Test Bad Blocks or click Test Bad Blocks.
NOTE: You must read the detail log (SCSI log) to view the results of
these tests. See “The Detail Log” on page 113.