I just tried this with CentOS 5.3 as well, and got exactly the same symptoms and dmesg output. (As a point of comparison, Ubunu 8.04 on my work laptop is able to access the drive.) Obviously "not detected" is a misapprehension, though I'm puzzled why "lsusb" doesn't show it. The device is there even though the partition table can't be read. ---------- Forwarded message ---------- From: Bart Schaefer <barton.schaefer at gmail.com> Date: Tue, Apr 28, 2009 at 10:58 AM Subject: Re: [CentOS] USB device not detected (CentOS 4.7) To: CentOS mailing list <centos at centos.org> On Tue, Apr 28, 2009 at 10:01 AM, Craig White <craigwhite at azapple.com> wrote: > On Tue, 2009-04-28 at 09:48 -0700, Bart Schaefer wrote: >> I recently purchased an I/O Magic USB enclosure for 3.5" IDE > ---- > check what it says about the drive in dmesg after you plugged it in. Hmm. usb 1-6: new high speed USB device using address 4 scsi7 : SCSI emulation for USB Mass Storage devices Vendor: HDS72251 Model: 6VLAT80 Rev: 0 0 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sdd: 321672960 512-byte hdwr sectors (164697 MB) sdd: assuming drive cache: write through SCSI device sdd: 321672960 512-byte hdwr sectors (164697 MB) sdd: assuming drive cache: write through (so far this is correct, it's a 160GB drive in the enclosure) (the leading space on the next line is literally there in dmesg) sdd:SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 ldm_validate_partition_table(): Disk read failed. SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 unable to read partition table Attached scsi disk sdd at scsi7, channel 0, id 0, lun 0 USB Mass Storage device found at 4 SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 0 Buffer I/O error on device sdd, logical block 0 SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 8 Buffer I/O error on device sdd, logical block 1 (the last three lines then repeat for each of sectors 16-568, logical blocks 2-71) SCSI error : <7 0 0 0> return code = 0x10070000 end_request: I/O error, dev sdd, sector 512 Buffer I/O error on device sdd, logical block 64 usb 1-6: USB disconnect, address 4 (that's where I unplugged)