Chris Oxenreider wrote:
That seems to isolate the problem to the handling of UDF rather than at the driver level. I have to go back and reread your OP and see what kernel, etc, you are using. I don't remember other reporting this issue, but I don't use UDF normally, so it's not something I can quickly test.I set the drives parameters to: hdparm -d1 -k1 -p4 -c1 /dev/hda The doccumentation for the drive lists it as PIO mode 4 and DMA mode 2. The listing of the parameters shows: hdparm -v /dev/hda /dev/hda: HDIO_GET_MULTCOUNT failed: Invalid argument IO_support = 1 (32-bit) unmaskirq = 1 (on) using_dma = 1 (on) keepsettings = 1 (on) readonly = 0 (off) readahead = 256 (on) HDIO_GETGEO failed: Invalid argument When I do the 'cp' a typical vmstat shows:r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 244 10208 16156 222516 0 0 0 24 1208 819 0 0 0 100Testing the speed shows: hdparm -t /dev/hda /dev/hda: Timing buffered disk reads: 14 MB in 3.14 seconds = 4.46 MB/sec Which is about 1mb slower than the DVD+RW 4x speed as listed in the specifications sheet [1]. So far this has only manafesed when attempting to treat a DVD+RW with a UDF file system as a removable hard disk. Burning a CD-R (I have not attempted to burn a DVD+R yet) works fine.[1] http://www.samsung.com/Products/OpticalDiskDrive/DVDRRW/OpticalDiskDrive_DVDRRW_TS_H552U_sp.htm
Thanks for all the data! -- bill davidsen <[EMAIL PROTECTED]> CTO TMR Associates, Inc Doing interesting things with small computers since 1979 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
