我的 USB 外置硬盘有问题。每次我将其插入 Xubuntu 14.04 服务器时，硬盘的分区表都会丢失。每次我都必须恢复 MBR 备份才能使其恢复功能。
当驱动器插入 Windows 或电视时不会发生此问题。当 Xubuntu 已在运行时插入硬盘时也不会发生此问题。只有在连接硬盘并重新启动后，分区才会消失。
以下是重启的 dmesg：
[ 3.136068] ata6: SATA link down (SStatus 0 SControl 300)
[ 3.357106] scsi 7:0:0:0: Direct-Access WD My Book 1130 1012 PQ: 0 ANSI: 6
[ 3.357846] scsi 7:0:0:1: Enclosure WD SES Device 1012 PQ: 0 ANSI: 6
[ 3.358158] sd 7:0:0:0: Attached scsi generic sg3 type 0
[ 3.358334] scsi 7:0:0:1: Attached scsi generic sg4 type 13
[ 3.358841] sd 7:0:0:0: [sdc] 732558336 4096-byte logical blocks: (3.00 TB/2.72 TiB)
[ 3.359466] sd 7:0:0:0: [sdc] Write Protect is off
[ 3.359471] sd 7:0:0:0: [sdc] Mode Sense: 47 00 10 08
[ 3.360082] sd 7:0:0:0: [sdc] No Caching mode page found
[ 3.360086] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 3.361229] sd 7:0:0:0: [sdc] 732558336 4096-byte logical blocks: (3.00 TB/2.72 TiB)
[ 3.362451] sd 7:0:0:0: [sdc] No Caching mode page found
[ 3.362454] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 3.792756] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
[ 6.621546] random: nonblocking pool is initialized
[ 10.356947] sd 7:0:0:0: [sdc] Invalid command failure
[ 10.356951] sd 7:0:0:0: [sdc]
[ 10.356953] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 10.356956] sd 7:0:0:0: [sdc]
[ 10.356958] Sense Key : Illegal Request [current]
[ 10.356962] sd 7:0:0:0: [sdc]
[ 10.356965] Add. Sense: Invalid field in cdb
[ 10.356968] sd 7:0:0:0: [sdc] CDB:
[ 10.356970] Read(10): 28 00 00 00 00 00 00 00 01 00
[ 10.356978] end_request: critical target error, dev sdc, sector 0
[ 10.356981] Buffer I/O error on device sdc, logical block 0
[ 12.204375] ldm_validate_partition_table(): Disk read failed.
[ 12.204391] Dev sdc: unable to read RDB block 0
[ 12.205230] sdc: unable to read partition table
[ 12.207726] sd 7:0:0:0: [sdc] 732558336 4096-byte logical blocks: (3.00 TB/2.72 TiB)
[ 12.209701] sd 7:0:0:0: [sdc] No Caching mode page found
[ 12.209704] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 12.209708] sd 7:0:0:0: [sdc] Attached SCSI disk
[ 12.210746] ses 7:0:0:1: Attached Enclosure device
fdisk：
Disk /dev/sdb: 3000.6 GB, 3000558944256 bytes
255 têtes, 63 secteurs/piste, 45599 cylindres, total 732558336 secteurs
Unités = secteurs de 1 * 4096 = 4096 octets
Taille de secteur (logique / physique) : 4096 octets / 4096 octets
taille d'E/S (minimale / optimale) : 4096 octets / 4096 octets
Identifiant de disque : 0x2052474d
Périphérique Amorçage Début Fin Blocs Id. Système
/dev/sdb1 * 256 536870655 2147481600 7 HPFS/NTFS/exFAT
/dev/sdb2 536876235 732547934 782686800 7 HPFS/NTFS/exFAT
有人能解释这种奇怪的行为吗？
提前致谢。