|
|
Scanning the medium for errors
To check your medium for read errors carry out these steps:
(Note: Under Windows 2000 and XP either administrator priviledges or an installed
ASPI driver are required in order to access the CD/DVD drives.)
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.
Scanning the medium using the command line
Scanning requires the following parameters (defaults are given in parenthesis):
user@linux> dvdisaster -s -d /dev/hdc -e corrdata.ecc
dvdisaster-0.66 Copyright 2004-2006 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.
|
The reported read errors may be different from "Medium Error; ..."
as these depend on the drive's firmware.
|