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Pořád to zlobí. Mám podrobnější informace:

Jsou tam 3 režimy - idle, standby a power down. disk se z režimu standby (který se po několika dalších minutách nepoužívání disku přepne na "power save") probouzí v pořádku. Stejně tak i z režimu "power down", kdy je disk vypnutý. /dev/sdX zařízení je stále vidět. problémy nasávají, pokud je disk v tomto režimu velmi dlouho.

Takhle nějak to vypadá v debianu po připojení disku a přimountování (reiserfs) a po vstupu do přimountovaného adresáře asi po hodnině:

[570153.224364] usb 1-1: USB disconnect, address 6
[570172.548063] usb 1-1: new high speed USB device using ehci_hcd and address 7
[570172.668090] usb 1-1: device descriptor read/64, error -71
[570172.913348] usb 1-1: configuration #1 chosen from 1 choice
[570172.924002] scsi2 : SCSI emulation for USB Mass Storage devices
[570172.964226] usb-storage: device found at 7
[570172.964250] usb-storage: waiting for device to settle before scanning
[570172.965716] usb 1-1: New USB device found, idVendor=152d, idProduct=2339
[570172.974433] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=5
[570172.991376] usb 1-1: Product: USB to ATA/ATAPI Bridge
[570173.003348] usb 1-1: Manufacturer: JMicron
[570173.011914] usb 1-1: SerialNumber: DCXXXXXXXXFF
[570177.964284] usb-storage: device scan complete
[570177.965267] scsi 2:0:0:0: Direct-Access     WDC WD10 EACS-00C7B0           PQ: 0 ANSI: 2 CCS
[570177.985951] sd 2:0:0:0: [sda] 1953523055 512-byte hardware sectors (1000204 MB)
[570178.024532] sd 2:0:0:0: [sda] Write Protect is off
[570178.032997] sd 2:0:0:0: [sda] Mode Sense: 00 38 00 00
[570178.033014] sd 2:0:0:0: [sda] Assuming drive cache: write through
[570178.056237] sd 2:0:0:0: [sda] 1953523055 512-byte hardware sectors (1000204 MB)
[570178.080005] sd 2:0:0:0: [sda] Write Protect is off
[570178.088005] sd 2:0:0:0: [sda] Mode Sense: 00 38 00 00
[570178.092000] sd 2:0:0:0: [sda] Assuming drive cache: write through
[570178.100142]  sda: sda1
[570178.682441] sd 2:0:0:0: [sda] Attached SCSI disk
[570336.100602] ReiserFS: sda1: found reiserfs format "3.6" with standard journal
[570336.116985] ReiserFS: sda1: using ordered data mode
[570336.486358] ReiserFS: sda1: journal params: device sda1, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
[570336.518587] ReiserFS: sda1: checking transaction log (sda1)
[570336.581659] ReiserFS: sda1: Using r5 hash to sort names
[574762.296064] usb 1-1: reset high speed USB device using ehci_hcd and address 7
[574762.445097] usb 1-1: device firmware changed
[574762.453074] usb 1-1: USB disconnect, address 7
[574762.461741] sd 2:0:0:0: [sda] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
[574762.478362] end_request: I/O error, dev sda, sector 663509639
[574762.487211] ReiserFS: sda1: warning: vs-13070: reiserfs_read_locked_inode: i/o failure occurred trying to find stat data of [5 35 0x0 SD]
[574762.515069] Buffer I/O error on device sda1, logical block 250
[574762.516028] lost page write due to I/O error on sda1
[574762.516028] Buffer I/O error on device sda1, logical block 251
[574762.516028] lost page write due to I/O error on sda1
[574762.516028] Buffer I/O error on device sda1, logical block 252
[574762.516028] lost page write due to I/O error on sda1
[574762.566150] ReiserFS: sda1: warning: vs-13070: reiserfs_read_locked_inode: i/o failure occurred trying to find stat data of [5 35 0x0 SD]
[574762.587990] REISERFS: abort (device sda1): Journal write error in flush_commit_list
[574762.604044] REISERFS: Aborting journal for filesystem on sda1
[574762.613327] Buffer I/O error on device sda1, logical block 254
[574762.614987] lost page write due to I/O error on sda1
[574762.614987] Buffer I/O error on device sda1, logical block 255
[574762.614987] lost page write due to I/O error on sda1
[574762.614987] Buffer I/O error on device sda1, logical block 257
[574762.614987] lost page write due to I/O error on sda1
[574762.614987] Buffer I/O error on device sda1, logical block 258
[574762.614987] lost page write due to I/O error on sda1
[574762.684146] ReiserFS: sda1: warning: vs-13070: reiserfs_read_locked_inode: i/o failure occurred trying to find stat data of [5 37 0x0 SD]
[574762.711243] ReiserFS: sda1: warning: vs-13070: reiserfs_read_locked_inode: i/o failure occurred trying to find stat data of [5 37 0x0 SD]
[574762.742523] ReiserFS: sda1: warning: zam-7001: io error in reiserfs_find_entry
[574762.763466] ReiserFS: sda1: warning: zam-7001: io error in reiserfs_find_entry
...
[574762.878083] usb 1-1: new high speed USB device using ehci_hcd and address 8
[574762.893620] ReiserFS: sda1: warning: zam-7001: io error in reiserfs_find_entry
[574762.918267] ReiserFS: sda1: warning: zam-7001: io error in reiserfs_find_entry
...
[574763.030155] usb 1-1: device descriptor read/64, error -71
[574763.043495] ReiserFS: sda1: warning: zam-7001: io error in reiserfs_find_entry
[574763.068020] ReiserFS: sda1: warning: zam-7001: io error in reiserfs_find_entry
...
[574763.356630] usb 1-1: configuration #1 chosen from 1 choice
[574763.393154] scsi3 : SCSI emulation for USB Mass Storage devices
[574763.418529] usb-storage: device found at 8
[574763.418552] usb-storage: waiting for device to settle before scanning
[574763.419861] usb 1-1: New USB device found, idVendor=152d, idProduct=2339
[574763.430746] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=5
[574763.451699] usb 1-1: Product: USB to ATA/ATAPI Bridge
[574763.463736] usb 1-1: Manufacturer: JMicron
[574763.474203] usb 1-1: SerialNumber: 15YYYYYYYYB6
[574763.505784] ReiserFS: sda1: warning: zam-7001: io error in reiserfs_find_entry
[574763.556018] ReiserFS: sda1: warning: zam-7001: io error in reiserfs_find_entry
...
[574768.416384] usb-storage: device scan complete
[574769.931873] scsi 3:0:0:0: Direct-Access     WDC WD10 EACS-00C7B0           PQ: 0 ANSI: 2 CCS
[574769.970189] sd 3:0:0:0: [sdb] 1953523055 512-byte hardware sectors (1000204 MB)
[574770.000019] sd 3:0:0:0: [sdb] Write Protect is off
[574770.008726] sd 3:0:0:0: [sdb] Mode Sense: 00 38 00 00
[574770.008743] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[574770.035269] sd 3:0:0:0: [sdb] 1953523055 512-byte hardware sectors (1000204 MB)
[574770.070801] sd 3:0:0:0: [sdb] Write Protect is off
[574770.080158] sd 3:0:0:0: [sdb] Mode Sense: 00 38 00 00
[574770.080175] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[574770.090422]  sdb: sdb1
[574770.686116] sd 3:0:0:0: [sdb] Attached SCSI disk

Pozn.: zajímavé je, že SerialNumber se liší (jsou částečně cenzurovaná). Trojtečka znamená opakování předchozího řádku