Bug 24113 - IDE drive not running at full ATA-100
IDE drive not running at full ATA-100
Status: CLOSED NOTABUG
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
7.1
i386 Linux
medium Severity medium
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Assigned To: Michael K. Johnson
Brock Organ
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Depends On:
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Reported: 2001-01-16 10:28 EST by Bryan Leopard
Modified: 2007-04-18 12:30 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-01-22 15:11:55 EST
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Description Bryan Leopard 2001-01-16 10:28:52 EST
Compaq ML330ES
Florence Beta 2

This unit has an ATA-100 capable drive and controller, but the kernel is 
not enabling mode udma5.  Verified by running hdparm -i

workaround:
Enable udma5 manually using hdparm.
Comment 1 Arjan van de Ven 2001-01-22 13:50:01 EST
Do not ever use hdparm to enable udma5. Use the "ide1=ata" on the lilo
command-line, but only if you have the proper (80 ribbon) cable.

The reason that the parameter is needed is that linux is not quite capable
of detecting the presence of this cable, and assumes the safe default of not
having the cable.
Comment 2 Arjan van de Ven 2001-01-22 15:11:51 EST
make that "ide1=ata66"
Comment 3 Arjan van de Ven 2001-02-23 07:54:51 EST
Closing as not a bug, as this isn't one.

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