Hi:
In an attempt to know if my optical drive /dev/hdc has DMA mode enabled, I ran
Code:
$ sudo /usr/sbin/hdparm -I /dev/hdc
/dev/hdc:
ATAPI CD-ROM, with removable media
Model Number: PHILIPS SPD2417T
Serial Number:
Firmware Revision: P1.0
Standards:
Supported: CD-ROM ATAPI-3 -4 -5 -6 -7
Configuration:
DRQ response: 50us.
Packet size: 12 bytes
Capabilities:
LBA, IORDY(cannot be disabled)
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=383ns IORDY flow control=120ns
$
but this does not seem to give the information I seek. Does somebody know how to get it? Perhaps /sbin/dmesg|grep some_string? BIOS setup menu does not mention DMA, except for the parallel port.
EDIT:
I also tried this:
Code:
root@darkstar:~# dmesg|grep hdc|grep DMA
ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:DMA
hdc: ATAPI 16X DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache, UDMA(66)
root@darkstar:~#
Does it mean that optical drive has DMA mode enabled? I do not think so.
