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Re: DVD writing speed (1x!) on a Samsung TS-H552U

Crispin Flowerday wrote:


I recently purchased a Samsung TS-H552U, which in the specs claims to be
a 16x writer, however both (the ubuntu version of) cdrecord and dvd
+rw-mediainfo claim is 8x, but thats not my main problem.

The problem is that it actually only seems to record at 1x, dvd
+rw-mediainfo (on a blank disk) reports:

$ dvd+rw-mediainfo /dev/hdc
INQUIRY:                [TSSTcorp][CD/DVDW TS-H552U][US03]
Mounted Media:         1Bh, DVD+R
Current Write Speed:   8.0x1385=11080KB/s
Write Speed #0:        8.0x1385=11080KB/s
Write Speed #1:        6.0x1385=8310KB/s
Write Speed #2:        4.0x1385=5540KB/s
Write Speed #3:        2.0x1385=2770KB/s
Speed Descriptor#0:    00/2295103 R@8.0x1385=11080KB/s W@8.0x1385=11080KB/s
Speed Descriptor#1:    00/2295103 R@8.0x1385=11080KB/s W@6.0x1385=8310KB/s
Speed Descriptor#2:    00/2295103 R@8.0x1385=11080KB/s W@4.0x1385=5540KB/s
Speed Descriptor#3:    00/2295103 R@8.0x1385=11080KB/s W@2.4x1385=3324KB/s

Note that there doesn't seem to be any 1x descriptor. This probably eliminates deleting the wrong descriptor somehow. Is it possible that your disk simply can't provide data any faster and that you're getting a bunch of underruns? For example, if you were burning a backup of a lot of little files, with lots of directory accesses, you might get an underrun due to all the seeks. If you combine mkisofs and write, the usual practice, this can happen.

Can you try creating the ISO image first and then burning? Or ar you already doing that?

Does anyone have any idea how to get the thing writing at 8x ?

bill davidsen <davidsen@tmr.com>
 CTO TMR Associates, Inc
 Doing interesting things with small computers since 1979

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