Hello.  Thank you very much.  This is just what I wanted.
-Brian

On Jul 14, 10:50pm, "Matthew Jacob" wrote:
} Subject: Re: Interpreting SCSI output messages
} >
} >
} > sd0(umass0:0:0):  Check Condition on CDB: 0x28 00 00 06 5a ea 00 00 20 00
} >    SENSE KEY:  Media Error
} >     ASC/ASCQ:  Medium Format Corrupted
} >
} > sd0(umass0:0:0):  Check Condition on CDB: 0x28 00 00 05 10 8a 00 00 20 00
} >    SENSE KEY:  Media Error
} >     ASC/ASCQ:  Medium Format Corrupted
} 
} 
} 0x28 = READ (Group1)
} 0x00 = (ignore)
} 0x00 = msw/msb, lba
} 0x05 = msw/lsb, lba
} 0x10 = lsw/msb, lba
} 0x8a = lsw/lsb, lba
} 0x00 = (ignore)
} 0x00 = msb, lba xfer count
} 0x20 = lsb, lba xfer count
} 
} so, 0x5108a == 33194
} 
} the other one left as an exercise.
} 
}  transfer_count = (((uint32_t)tmd->cd_cdb[7]) <<  8) |
} ((u_int32_t)tmd->cd_cdb[8]);
}         lba =
}             (((uint32_t)tmd->cd_cdb[2]) << 24) |
}             (((uint32_t)tmd->cd_cdb[3]) << 16) |
}             (((uint32_t)tmd->cd_cdb[4]) <<  8) |
}             ((uint32_t)tmd->cd_cdb[5]);
} 
} >
} >
>-- End of excerpt from "Matthew Jacob"