On Tue, 2005-11-08 at 20:35 -0500, Preston Crow wrote: > I have two hard drives. If I simply cat /dev/dvb/adapter0/dvr0 to a > file on the SATA drive, I get some glitches. If I do the same to a file > on the PATA drive, I get tons of glitches. If I do it to a ram disk, I > get a perfect recording.
And one more update: I've found the solution for the PATA drive is to set the multisector I/O count to 16 (it was 0) # hdparm -m16 /dev/hdc Unfortunately, I don't seem to be able to set any useful parameters on my SATA drive: /dev/sda: IO_support = 0 (default 16-bit) readonly = 0 (off) readahead = 16 (on) Trying to change IO_support gives an error: setting 32-bit IO_support flag to 1 HDIO_SET_32BIT failed: Invalid argument It also doesn't seem to have a multisector I/O option. So it does look like some performance improvements on the SATA drive are what I need, but the tuning options aren't exposed. --PC
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