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Scanning the medium for errors
To check your medium for read errors insert it into your drive and enter:
user@linux> dvdisaster -s
dvdisaster-0.64pl2 Copyright 2004,2005 Carsten Gnoerlich.
[... remainder of the GPL announcement ...]
Device: /dev/cdrom, ATAPI DVD+RW 8X4X12 B2K7
Medium: DVD+R, 2224288 sectors, 1 layer(s)
Scanning medium for read errors.
Waiting 5 seconds for drive to spin up...
Sector 57664: Medium Error; Unrecovered read error. Skipping 15 sectors.
Sector 57728: Medium Error; Unrecovered read error. Skipping 15 sectors.
[... more read error reports ...]
Sector 716640: Medium Error; Unrecovered read error. Skipping 15 sectors.
Read position: 100.0% ( 2.4x)
33840 unreadable sectors.
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The reported read errors may be different from "Medium Error; ..."
as these depend on the drive's firmware.
How frequently should the media be scanned?
This depends on your media quality and storage conditions.
As a guide line for CD- and DVD media of unknown quality:
- 3 days after burning (keep the media images on hard disc until this test passes!),
- 14 days after burning,
- 3 months after burning,
- then one more scan after each 6 months.
If you're using lots of media from the same production of a high quality manufacturer,
it may be sufficient to scan a sample of 2-3 media per month and batch.
Recovering a medium image...
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