Alan Cox wrote:
Aug 9 07:41:29 monet kernel: ata1.00: limiting speed to UDMA/66:PIO4
Aug 9 07:41:29 monet kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr
0x0 action 0x2
Aug 9 07:41:29 monet kernel: ata1.00: (BMDMA stat 0x64)
Aug 9 07:41:29 monet kernel: ata1.00: cmd
c8/00:08:fb:7c:a1/00:00:00:00:00/e0 tag 0 cdb 0x12 data 4096 in
Aug 9 07:41:29 monet kernel: res
51/84:00:00:00:00/00:00:00:00:00/e0 Emask 0x10 (ATA bus error)
Aug 9 07:41:29 monet kernel: ata1: soft resetting port
Aug 9 07:41:29 monet kernel: ata1.00: configured for UDMA/66
Aug 9 07:41:29 monet kernel: ata1.01: configured for UDMA/33
Aug 9 07:41:29 monet kernel: ata1: EH complete
Drops to UDMA33 for 40 wire cable.
It drops from UDMA/100 to UDMA/66 for the disk, but stays at UDMA/33 for
the optical drive. If I have only the disk on that controller, the disk
still drops to UDMA/66.
Looks to me like your cabling is out of spec or you have electrical noise
problems.
I've tried different cabling solutions, including round and flat IDE
cables. What might cause "electrical noise"? Are 44-40 pin adapters
reliable?
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