Re: Slow writer...

From: Jens Axboe (
Date: Wed Jul 02 2003 - 06:17:08 EST

On Tue, Jul 01 2003, DervishD wrote:
> Hi all :))
> I've installed a PlexWriter Premium (52x) in my system, and the
> highest speed I can achieve with it is 24x with data and 15x with
> audio (the speed difference is quite strange :??). The hard disk is
> UDMA5, so it should provide the data at 52x. This is the info for the
> hard disk:
> /dev/root:
> Model=ST340016A, FwRev=3.05, SerialNo=3HS040AC
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=16
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78165360
> IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
> PIO modes: pio0 pio1 pio2 pio3 pio4
> DMA modes: mdma0 mdma1 mdma2
> UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
> AdvancedPM=no WriteCache=enabled
> Drive conforms to: device does not report version: 1 2 3 4 5
> As you can see, the udma5 mode is active, and this is a test from
> hdparm on the same disk:
> /dev/root:
> Timing buffered disk reads: 64 MB in 1.58 seconds = 40.51 MB/sec
> Am I doing something wrong, like not tuning correctly something
> in the disk? I am using a DIY box with Linux 2.4.21, CPU Duron 850,
> and no processes are running while burning in order to not disturb
> the writing process. I'm afraid that DMA is not working properly or
> maybe the motherboard is damaged or something like that :??


- Is the cd writer on a different channel?
- What ide adapter are you using?
- Is dma enabled on the cd writer?
- What cdrecord version are you using?

You should try 2.5.73 as well and see if it makes any difference. Make
sure to use -dev=/dev/hdc (or whatever your cd-rw drive is) and _don't_
use ide-scsi (just ide-cd)

Jens Axboe

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