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http://www.berklix.com/~jhs/txt/dvds.html
DVD Media & drive Analysis To analyse failure modes
Not of general public browsing interest.
See Also: http://www.cdspeed2000.com/
For data recovery, it's best to do a mount, then tar, as that does retries.
whereas raw dd (& slice) give up early.
I can't find the CRC ECC checking in BSD /sys
On host=laps, a mount of /dev/acd0 + tar failed (hanging) after 2 Gig.
a mount of /dev/cd0 (using the scsi to atapi kernel hacks) read all
4.5 Gig (though whether the data is valid is not yet known).
laps acd0 has given short files, & files with blocks of sero in.
laps cd0 has also delivered nulls
film on single speed has also delivered nulls twice while laps delivered OK.
-------------
DVD_Media: Bulkpaq.co.uk DVD-R 8x Generation 4
write_host: jes
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: mount fails
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: reads all 3.6G OK
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: bytes=3691053056 count=1802272 2273576 bytes/sec
xs dd if=/dev/cd0 bs=2k of=bulkpaq.iso
}{
read_driver: acd
result: bytes=3691053056
}
}
DVD_Media: Datawrite
write_host: jes
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: mount fails
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: bytes=3920265216 count=1914192
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: LATER
}{
read_driver: acd
result: LATER
}
}
DVD_Media: Intenso 4.2G DVD+R 1x-8x
write_host: eww@
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: readable.
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: LATER
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: LATER
}{
read_driver: acd
result: LATER
}
}
DVD_Media: Philips DVD+RW 4.7G
write_host: gj@
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: mount fails
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: LATER
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: LATER
}{
read_driver: acd
result: LATER
}
}
DVD_Media: Plain White
write_host: jes
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: dd fails
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: LATER
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: LATER
}{
read_driver: acd
result: LATER
}
}
DVD_Media: *import
write_host: pas
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: mount fails
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: dd fails after 1.1 Gig, mount + tar reads 4.5 Gig
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: dd fails after 200M
}{
read_driver: acd
result: dd fails after 500M
}
}
DVD_Media: *shake
write_host: pas
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: mount fails
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: FAILED:
xs cdcontrol -f /dev/acd0 info
dd if=/dev/acd0 bs=2k
162889728 bytes count=79536
RUNNING:
mount /cdrom
cdcontrol -f /dev/acd0 speed 1
tar 4.445 Gig read.
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: dd fails after 1.3 Gig, mount + tar reads 4.5 Gig
}{
read_driver: acd
result: dd fails after 690 M, mount + tar fails, hangs after 2.1 G
find . -type f -print | sort | xargs ls -l ; du
20480 Oct 21 20:53 ./video_ts/video_ts.bup
20480 Oct 21 20:53 ./video_ts/video_ts.ifo
931840 Oct 21 20:53 ./video_ts/video_ts.vob
88064 Oct 21 20:53 ./video_ts/vts_01_0.ifo
3631104 Oct 21 19:44 ./video_ts/vts_01_0.vob
1073739776 Oct 21 20:53 ./video_ts/vts_01_1.vob
1073734656 Mar 2 16:22 ./video_ts/vts_01_2.vob
find . -type f -exec cmpd -d -v {} ../cd0 \;
./video_ts/video_ts.ifo Deleted
./video_ts/video_ts.vob Deleted
./video_ts/video_ts.bup Deleted
./video_ts/vts_01_0.ifo Deleted
./video_ts/vts_01_0.vob Deleted
./video_ts/vts_01_1.vob Different:
char 443 in line 302, (byte 196611)
./video_ts/vts_01_2.vob Different:
char 1073734657 in line 1, (byte 1073734657)
l video_ts
1073739776 Oct 21 20:53 vts_01_1.vob*
1073734656 Mar 2 16:22 vts_01_2.vob*
}
}
DVD_Media: Budget www.01ne.co.uk 1-4X DVD-R *ital
write_host: jes
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: mount fails
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: LATER
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: LATER
}{
read_driver: acd
result: LATER
}
}
DVD_Media Lehmanss BSD
write_host lehmans factory, label Doesnt say +/-
paper labels claims over 8 Gig. Du -s -k : 8209989
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: mount OK, du OK, dd reads 8494317568 bytes
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: LATER
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: LATER
}{
read_driver: acd
result: LATER
}
}
DVD_Media: Linux Mag 2004 multi Knopiix
write_host: lehmans factory, label Doesnt say +/-
Du -s -k : 3.8 G
read_uname: 5.3r
{
read_host: dual
read_drive: NEC DV-5700A/1.91
read_driver: acd0
result: mount OK, dd read 3935348736 bytes
}{
read_host: film
read_drive: COMPAQ DVD-ROM DRD-8120B/1.09
read_driver: acd0
result: LATER
}{
read_host: laps
read_drive: UJDA730 DVD/CDRW/1.00
{
read_driver: cd
result: LATER
}{
read_driver: acd
result: LATER
}
}
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