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-c1 enables 32-bit I/O
-d1 enables DMA
-X66 enables ATA/33
{|
| PIO mode
0 -X08 3.3MB/sec▼
|-
1 -X09 5.2MB/sec▼
|-
3 -X11 11.1MB/sec▼
|-
|-
|-
|}
{|
MW DMA mode Switch Burst Rate▼
| Cell 1, row 1 || Cell 2, row 1
|-
| Cell 1, row 2 || Cell 2, row 2
▲2 -X34 16.6MB/sec
|}
{|
UDMA mode Switch Burst Rate▼
2 (ATA/33) -X66 33MB/sec▼
|-
4 (ATA/66) -X68 66MB/sec▼
|-
|-
|2 || -X34 || 16.6MB/sec
|}
{|
|-
▲|2 (ATA/33) || -X66 || 33MB/sec
|-
▲|4 (ATA/66) || -X68 || 66MB/sec
|-
|5 (ATA/100) || -X69 || 100MB/sec
|}
[[Red Hat]] uses /etc/rc.sysinit to call scripts /etc/sysconfig/harddiskhda, /etc/sysconfig/harddiskhdb, etc. to run hdparm upon boot.
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Revision as of 20:30, 25 July 2005
hdparm is used in Linux for setting harddisk options.
To view current settings, simply run: hdparm /dev/hda (or /hdb, /hdc, etc.)
-c1 enables 32-bit I/O
-d1 enables DMA
-X66 enables ATA/33
PIO mode | Switch | Burst Rate |
0 | -X08 | 3.3MB/sec |
1 | -X09 | 5.2MB/sec |
2 | -X10 | 8.3MB/sec |
3 | -X11 | 11.1MB/sec |
4 | -X12 | 16.7MB/sec |
Cell 1, row 1 | Cell 2, row 1 |
Cell 1, row 2 | Cell 2, row 2 |
MW | DMA mode | Switch | Burst Rate |
0 | -X32 | 4.2MB/sec | |
1 | -X33 | 13.3MB/sec | |
2 | -X34 | 16.6MB/sec |
UDMA mode | Switch | Burst Rate |
2 (ATA/33) | -X66 | 33MB/sec |
4 (ATA/66) | -X68 | 66MB/sec |
5 (ATA/100) | -X69 | 100MB/sec |
Red Hat uses /etc/rc.sysinit to call scripts /etc/sysconfig/harddiskhda, /etc/sysconfig/harddiskhdb, etc. to run hdparm upon boot.
File: /etc/sysconfig/harddiskhda:
USE_DMA=1
EIDE_32BIT=1
To enable DMA during boot, add the following line to your lilo.conf file:
append = "ide0=dma"