Testing 1 hard disk in 3 different usb enclosures: kernel reports 3 different "numbers of sectors"

Testing 1 hard disk in 3 different usb enclosures: kernel reports 3 different "numbers of sectors"

[Jaime T]

Hi,

I'd like to use my 1TB Seagate hard disk on my linux box, and I've
tested it using 3 different usb-sata enclosures. Here are the syslog
entries when I plug it in:

kernel: [10611.884111] usb 1-1: new high-speed USB device number 23
using ehci_hcd
kernel: [10612.017588] usb 1-1: New USB device found, idVendor=14cd,
idProduct=6116
kernel: [10612.017596] usb 1-1: New USB device strings: Mfr=1,
Product=3, SerialNumber=2
kernel: [10612.017602] usb 1-1: Product: USB Mass Storage Device
kernel: [10612.017607] usb 1-1: Manufacturer: Generic
kernel: [10612.017612] usb 1-1: SerialNumber: 116AC2101219
kernel: [10612.018116] scsi25 : usb-storage 1-1:1.0
kernel: [10613.017043] scsi 25:0:0:0: Direct-Access        Mass
Storage Device        PQ: 0 ANSI: 0
kernel: [10613.019553] sd 25:0:0:0: Attached scsi generic sg2 type 0
kernel: [10613.019646] sd 25:0:0:0: [sdb] 1953525166 512-byte logical
blocks: (1.00 TB/931 GiB)

kernel: [10730.084090] usb 1-1: new high-speed USB device number 24
using ehci_hcd
kernel: [10730.225053] usb 1-1: New USB device found, idVendor=152d,
idProduct=2509
kernel: [10730.225061] usb 1-1: New USB device strings: Mfr=1,
Product=11, SerialNumber=3
kernel: [10730.225067] usb 1-1: Product: Usb production
kernel: [10730.225072] usb 1-1: Manufacturer: JMicron
kernel: [10730.225077] usb 1-1: SerialNumber: 20120912000A
kernel: [10730.225912] scsi26 : usb-storage 1-1:1.0
kernel: [10731.224882] scsi 26:0:0:0: Direct-Access     Jmicron  Corp.
                PQ: 0 ANSI: 2 CCS
kernel: [10731.226702] sd 26:0:0:0: Attached scsi generic sg2 type 0
kernel: [10731.227818] sd 26:0:0:0: [sdb] 1953524995 512-byte logical
blocks: (1.00 TB/931 GiB)

kernel: [10837.176146] usb 1-2: new high-speed USB device number 25
using ehci_hcd
kernel: [10837.309203] usb 1-2: New USB device found, idVendor=152d,
idProduct=2339
kernel: [10837.309212] usb 1-2: New USB device strings: Mfr=1,
Product=2, SerialNumber=5
kernel: [10837.309218] usb 1-2: Product: USB to ATA/ATAPI Bridge
kernel: [10837.309223] usb 1-2: Manufacturer: JMicron
kernel: [10837.309228] usb 1-2: SerialNumber: 29FCA11600FF
kernel: [10837.310184] scsi27 : usb-storage 1-2:1.0
kernel: [10838.308908] scsi 27:0:0:0: Direct-Access     ST1000LM 024
HN-M101MBB        PQ: 0 ANSI: 2 CCS
kernel: [10838.310727] sd 27:0:0:0: Attached scsi generic sg2 type 0
kernel: [10838.311867] sd 27:0:0:0: [sdb] 1953525168 512-byte logical
blocks: (1.00 TB/931 GiB)

So Linux (v3.10.25) is reporting 3 different sizes/numbers of sectors
for the same single hard disk. Could this be a problem with regards to
possible future data corruption, or is it something that I can safely
ignore?

Many thanks, Jaime

Re: Testing 1 hard disk in 3 different usb enclosures: kernel reports 3 different "numbers of sectors"

[Clemens Ladisch]

Jaime T wrote:
> I'd like to use my 1TB Seagate hard disk on my linux box, and I've
> tested it using 3 different usb-sata enclosures.
>
> kernel: [10612.017588] usb 1-1: New USB device found, idVendor=14cd, idProduct=6116
> kernel: [10612.017602] usb 1-1: Product: USB Mass Storage Device
> kernel: [10612.017607] usb 1-1: Manufacturer: Generic
> kernel: [10730.225053] usb 1-1: New USB device found, idVendor=152d, idProduct=2509
> kernel: [10730.225067] usb 1-1: Product: Usb production
> kernel: [10730.225072] usb 1-1: Manufacturer: JMicron
> kernel: [10837.309203] usb 1-2: New USB device found, idVendor=152d, idProduct=2339
> kernel: [10837.309218] usb 1-2: Product: USB to ATA/ATAPI Bridge
> kernel: [10837.309223] usb 1-2: Manufacturer: JMicron
>
> kernel: [10613.019646] sd 25:0:0:0: [sdb] 1953525166 512-byte logical blocks: (1.00 TB/931 GiB)
> kernel: [10731.227818] sd 26:0:0:0: [sdb] 1953524995 512-byte logical blocks: (1.00 TB/931 GiB)
> kernel: [10838.311867] sd 27:0:0:0: [sdb] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB)
>
> So Linux (v3.10.25) is reporting 3 different sizes/numbers of sectors
> for the same single hard disk.

The kernel just reports what the device reports.

> Could this be a problem with regards to possible future data
> corruption, or is it something that I can safely ignore?

It is likely that you will not be able to access the sectors beyond
the reported limit.  It might be possible that the enclosure does not
ignore those sectors but uses them to store its own management data.


Regards,
Clemens