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Operating Systems => Linux and UNIX => Topic started by: Ice-9 on 29 January 2003, 02:47

Title: udma for cdrom?
Post by: Ice-9 on 29 January 2003, 02:47

Code: [Select]

This is the output of /proc/ide/piix
I've been checking the udma settings of my drives and I notice that the dma settings are different for my harddrives and for my cd/dvd drives?

Both my harddrives are on ide1 and cd/dvd are on ide2.
Why do the drives on ide1 return a value of 5 under udma settings and the drives on ide2 a value of 2?

Could it be that udma is not "fully" enabled for my cd/dvd drives?
How would I correct that?
Can I use hdparm -d1 to enable udma for a cdrom as I would do for a hraddrive?

[ January 28, 2003: Message edited by: Ice9 ]

Title: udma for cdrom?
Post by: KernelPanic on 30 January 2003, 22:30

UDMA 2 means that the CD-ROM is running on the 33MB/s version of ATAPI. Your Harddrives mode of 5 means 100MB/s ATA.

At present CD-ROM/DVD drives only use UDMA mode 2 (33MB/s) because they do not need the same data throughput as a HDD.

Your device therefore is running in the correct mode, no need to worry....

Title: udma for cdrom?
Post by: membrax on 3 February 2003, 01:29

This one was quite obvious IM(not so)HO