Hi, all.
 I use 4 ide hard drivers(wd2~wd5) for configure CCD under 1.6.2 and 
 there is no error occured when I setup them.
 But when I reboot my system, I find such messages -
 [...]
 wd3: transfer error, downgrading to Ultra-DMA mode 2
 wd2(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
 wd3(pciide1:0:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
 wd3d: error reading fsbn 1 (wd3 bn 1; cn 0 tn 0 sn 1), retrying
 wd3: (aborted command, interface CRC error)
 wd3: soft error (corrected)
 wd4: transfer error, downgrading to Ultra-DMA mode 2
 wd4(pciide1:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
 wd5(pciide1:1:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
 wd4d: error reading fsbn 1 (wd4 bn 1; cn 0 tn 0 sn 1), retrying
 wd4: (aborted command, interface CRC error)
 wd4: soft error (corrected)
 [...]
 
 What does it mean about 'interface CRC error'?
 BTW, I also find that I can't disklabe the drivers after wd5,
 e.g.
 ftp# disklabel /dev/wd6
 disklabel: ioctl DIOCGDINFO: Inappropriate ioctl for device
 
 only if I type 'disklabel /dev/wd6d'.
 
 Could someone please help me resolve it?