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jaw
n00b
Joined: 05 May 2005
Posts: 5
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 Posted: Sun May 08, 2005 6:07 pm Post subject: DMA Modes for WD800JB |
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I'm having an interesting problem. I have a Wester Digital 800 JB hdd and I know it supports UDMA mode 5. It is an ATA100 drive. However when I do 'hdparm -i /dev/hda' i get:
| Code: | athlonPower linux # hdparm -i /dev/hda
/dev/hda:
Model=WDC WD800JB-00CRA1, FwRev=17.07W17, SerialNo=WD-WMA8E2855354
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=156301488
IORDY=on/off, tPIO={min:120,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
AdvancedPM=no WriteCache=enabled
Drive conforms to: device does not report version:
* signifies the current active mode |
It lists the max transfer mode as UDMA2.
Here is the output of hdparm -tT /dev/hda
| Code: | athlonPower linux # hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 1400 MB in 2.01 seconds = 698.01 MB/sec
Timing buffered disk reads: 140 MB in 3.03 seconds = 46.24 MB/sec |
Not so bad but how do i find out if this is just a fluke or what? How dow i find out what UDMA transfer mode it is using?
I have an nforce2 chipset. Here is the applicable section of my kernel config.
| Code: | [*] Use PCI DMA by default when available
[ ] Enable DMA only for disks
< > AEC62XX chipset support
< > ALI M15x3 chipset support
<*> AMD and nVidia IDE support
< > ATI IXP chipset IDE support
< > CMD64{3|6|8|9} chipset support
< > Compaq Triflex IDE support
< > CY82C693 chipset support
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Am I missing something specific for Western Digital Drives?
Any help would be appreciated. Thanks in advance.
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moocha
Watchman
Joined: 21 Oct 2003
Posts: 5722
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| Posted: Sun May 08, 2005 6:22 pm Post subject: |
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Does(note the uppercase i) say the same? I seem to recall that hdparm had a bug at some point where it wouldn't show the active transfer mode when using -i and the active mode was higher than UDMA2, despite the fact that a faster mode was active. -I would show the correct mode though. Looks like your hdparm does this (note that the active mode isn't shown - no * there at all - while it's clearly a higher mode since the transfer speed is normal for UDMA5).
It's fixed in hdparm 6.1 at least (the version I'm using).
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jaw
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Joined: 05 May 2005
Posts: 5
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| Posted: Sun May 08, 2005 7:07 pm Post subject: |
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Thanks, that helped. It is using UDMA5 and it shows it now.
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