C'est parce que toutes les données SMART ne sont pas obligatoires, seul l'état de santé global du disque l'est.
Pour comparaison, Fujitsu 73Go SCSI U320 10000rpm
root@nikita:~# smartctl -a /dev/sdc
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-54-generic] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Vendor: FUJITSU
Product: MAP3735NP
Revision: 5605
User Capacity: 73 407 820 800 bytes [73,4 GB]
Logical block size: 512 bytes
Rotation Rate: 10025 rpm
Serial number: UPG3P2C0083J
Device type: disk
Transport protocol: Parallel SCSI (SPI-4)
Local Time is: Sun Sep 6 10:04:59 2015 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Enabled
=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK
Current Drive Temperature: 26 C
Drive Trip Temperature: 65 C
Manufactured in week 51 of year 2002
Specified cycle count over device lifetime: 10000
Accumulated start-stop cycles: 556
Elements in grown defect list: 0
Error counter log:
Errors Corrected by Total Correction Gigabytes Total
ECC rereads/ errors algorithm processed uncorrected
fast | delayed rewrites corrected invocations [10^9 bytes] errors
read: 0 241 0 0 0 176294,849 0
write: 0 123 0 0 0 71885,676 0
verify: 0 0 0 0 0 0,320 0
Non-medium error count: 732
SMART Self-test log
Num Test Status segment LifeTime LBA_first_err [SK ASC ASQ]
Description number (hours)
# 1 Background long Completed - 45915 - [- - -]
# 2 Background long Completed - 0 - [- - -]
# 3 Background short Completed - 0 - [- - -]
Long (extended) Self Test duration: 2191 seconds [36,5 minutes]
Hitachi 73Go U320 15k rpm
root@nikita:~# smartctl -a /dev/sdd
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-54-generic] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Vendor: HITACHI
Product: HUS151473VL3600
Revision: S3BA
User Capacity: 73 407 820 800 bytes [73,4 GB]
Logical block size: 512 bytes
Rotation Rate: 15000 rpm
Logical Unit id: 0x5000cca006d49d75
Serial number: JCWGAVLK
Device type: disk
Transport protocol: Parallel SCSI (SPI-4)
Local Time is: Sun Sep 6 10:06:33 2015 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Enabled
=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK
Current Drive Temperature: 33 C
Drive Trip Temperature: 85 C
Manufactured in week 20 of year 2007
Specified cycle count over device lifetime: 50000
Accumulated start-stop cycles: 960
Elements in grown defect list: 0
Vendor (Seagate) cache information
Blocks sent to initiator = 706832565796864
Error counter log:
Errors Corrected by Total Correction Gigabytes Total
ECC rereads/ errors algorithm processed uncorrected
fast | delayed rewrites corrected invocations [10^9 bytes] errors
read: 106718 32835 0 106718 11 1896,920 0
write: 99816 0 0 99816 0 855,047 0
verify: 9262 2267 0 9262 0 20,358 0
Non-medium error count: 1
SMART Self-test log
Num Test Status segment LifeTime LBA_first_err [SK ASC ASQ]
Description number (hours)
# 1 Background long Completed - 7232 - [- - -]
Long (extended) Self Test duration: 1205 seconds [20,1 minutes]
Comme tu peux le voir, sur chacun j'ai effectué un auto-test long afin d'avoir un vrai bilan, tu devrais faire de même.