Remember a while back when the subject of IDE cable length came up on the
freebsd stable mailing list and you were preaching the gospel of 18" or
less? Well...I just got a new motherboard (Abit VP6) and its manual
states:
"There are four requirements for attaining Ultra ATA-66 and ATA-100:
* The drive must support Ultra ATA-66 or ATA-100.
* The motherboard and system BIOS (or an add-in controller) must support
Ultra ATA/66 and ATA-100.
* The operating system must support Direct Memory Access (DMA), Microsoft
WIndows 98, Windows 98SE and Windows 95B (OSR2) support DMA.
* The cable must be an 80-pin conductor. The length should not exceed 18
inches. If all of the above requirements are met, you can enjoy the Ultra
ATA/66 and ATA-100 features of your computer system."
Yeah, the motherboard manual switches between a - and a / in there.
Yeah, more OSs than they mention there support DMA (obviously).
Sorry if this is dredging up old news that everybody already knows and
everything, but I just thought it was a useful tidbit and backed up your
point.
I guess if your drive bays are greater than 18" from your motherboard
connector, you'd better switch to SCSI.
FreeBSD Stable mailing list Cc:'d for the archives.
-Tenebrae.
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