it happens to me to have these error on one 4GB scsi disk, quantum:

Aug 10 07:57:08 nikita /netbsd: sd1(asc0:1:0):  Check Condition on
CDB: 0x2a 00 
00 3e f2 c0 00 00 10 00
Aug 10 07:57:09 nikita /netbsd:     SENSE KEY:  Recovered Error
Aug 10 07:57:10 nikita /netbsd:    INFO FIELD:  4125384
Aug 10 07:57:11 nikita /netbsd:  COMMAND INFO:  161875337 (0x9a60589)
Aug 10 07:57:12 nikita /netbsd:      ASC/ASCQ:  ASC 0x03 ASCQ 0xb0
Aug 10 07:57:13 nikita /netbsd:      FRU CODE:  0x80
Aug 10 07:57:14 nikita /netbsd:          SKSV:  Actual Retry Count: 10
Aug 10 07:57:15 nikita /netbsd: 

can I continue to use it ignoring the error or better I Replace disk ?
thanks

Rick