How to Force UDMA100 Mode on Boot?
cswiger at mac.com
Tue Aug 16 02:38:32 GMT 2005
Mark Kane wrote:
[ ... ]
> I know about atacontrol to set it manually, but I'd like to set UDMA100
> mode automatically on boot since I have 5 hard drives. I also know the
> sysctl hw.ata.ata_dma, but that doesn't say anything about using 100 vs
Your BIOS ought to have a setting which throttles this down.
Simply changing in within FreeBSD might be a little late, since the system has
to boot far enough to get to that, or you might run some other OS on the
machine one fine day. Anyway, consider:
echo "/sbin/atacontrol mode ..." >> /etc/rc.local
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