まず、Win7 環境から定番ソフトで確認した結果です。
中古ということで、どのくらい消耗しているのかが気がかりでしたが、SanDisk SSD Dashboard で「余寿命」が 100% でした。入手価格からすれば、よい買い物であったように感じます。
次は、CentOS6 環境で採取した smartctl -a の結果です。
smartctl 5.43 2016-09-28 r4347 [x86_64-linux-2.6.32-696.10.1.el6.x86_64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Model Family: Marvell based SanDisk SSDs
Device Model: SanDisk SDSSDXPS240G
Serial Number: xxxxxxxxx143
LU WWN Device Id: 5 001b44 yyyyyyyyy
Firmware Version: X21100RL
User Capacity: 240,057,409,536 bytes [240 GB]
Sector Size: 512 bytes logical/physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: ACS-2 revision 3
Local Time is: Sat Sep 23 18:53:25 2017 JST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: ( 0) seconds.
Offline data collection
capabilities: (0x11) SMART execute Offline immediate.
No Auto Offline data collection support.
Suspend Offline collection upon new
command.
No Offline surface scan supported.
Self-test supported.
No Conveyance Self-test supported.
No Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 10) minutes.
SMART Attributes Data Structure revision number: 4
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
5 Reallocated_Sector_Ct 0x0032 100 100 --- Old_age Always - 0
9 Power_On_Hours 0x0032 253 100 --- Old_age Always - 707
12 Power_Cycle_Count 0x0032 100 100 --- Old_age Always - 421
166 Min_W/E_Cycle 0x0032 100 100 --- Old_age Always - 1
167 Min_Bad_Block/Die 0x0032 100 100 --- Old_age Always - 45
168 Maximum_Erase_Cycle 0x0032 100 100 --- Old_age Always - 45
169 Total_Bad_Block 0x0032 100 100 --- Old_age Always - 606
171 Program_Fail_Count 0x0032 100 100 --- Old_age Always - 0
172 Erase_Fail_Count 0x0032 100 100 --- Old_age Always - 0
173 Avg_Write/Erase_Count 0x0032 100 100 --- Old_age Always - 14
174 Unexpect_Power_Loss_Ct 0x0032 100 100 --- Old_age Always - 76
184 End-to-End_Error 0x0032 100 100 --- Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 100 --- Old_age Always - 0
188 Command_Timeout 0x0032 100 100 --- Old_age Always - 3
194 Temperature_Celsius 0x0022 070 046 --- Old_age Always - 30 (Min/Max 16/46)
199 SATA_CRC_Error 0x0032 100 100 --- Old_age Always - 0
212 SATA_PHY_Error 0x0032 100 100 --- Old_age Always - 0
230 Perc_Write/Erase_Count 0x0032 100 100 --- Old_age Always - 46
232 Perc_Avail_Resrvd_Space 0x0033 100 100 004 Pre-fail Always - 100
233 Total_NAND_Writes_GiB 0x0032 100 100 --- Old_age Always - 3815
241 Total_Writes_GiB 0x0030 253 253 --- Old_age Offline - 2895
242 Total_Reads_GiB 0x0030 253 253 --- Old_age Offline - 4817
244 Thermal_Throttle 0x0032 000 100 --- Old_age Always - 0
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
No self-tests have been logged. [To run self-tests, use: smartctl -t]
Device does not support Selective Self Tests/Logging
次は、hdparm -I の結果です。
ATA device, with non-removable media
Model Number: SanDisk SDSSDXPS240G
Serial Number: xxxxxxxxx143
Firmware Revision: X21100RL
Media Serial Num:
Media Manufacturer:
Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
Used: unknown (minor revision code 0x0110)
Supported: 9 8 7 6 5
Likely used: 9
Configuration:
Logical max current
cylinders 16383 65535
heads 16 1
sectors/track 63 63
--
CHS current addressable sectors: 4128705
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 468862128
Logical Sector size: 512 bytes
Physical Sector size: 512 bytes
Logical Sector-0 offset: 0 bytes
device size with M = 1024*1024: 228936 MBytes
device size with M = 1000*1000: 240057 MBytes (240 GB)
cache/buffer size = unknown
Form Factor: 2.5 inch
Nominal Media Rotation Rate: Solid State Device
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 1 Current = 1
Advanced power management level: 128
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* SMART feature set
Security Mode feature set
* Power Management feature set
* Write cache
* Look-ahead
* Host Protected Area feature set
* WRITE_BUFFER command
* READ_BUFFER command
* DOWNLOAD_MICROCODE
* Advanced Power Management feature set
SET_MAX security extension
* 48-bit Address feature set
* Device Configuration Overlay feature set
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
* SMART error logging
* SMART self-test
* General Purpose Logging feature set
* WRITE_{DMA|MULTIPLE}_FUA_EXT
* 64-bit World wide name
* WRITE_UNCORRECTABLE_EXT command
* {READ,WRITE}_DMA_EXT_GPL commands
* Segmented DOWNLOAD_MICROCODE
* Gen1 signaling speed (1.5Gb/s)
* Gen2 signaling speed (3.0Gb/s)
* Gen3 signaling speed (6.0Gb/s)
* Native Command Queueing (NCQ)
* Host-initiated interface power management
* Phy event counters
* unknown 76[15]
* DMA Setup Auto-Activate optimization
* Device-initiated interface power management
* Software settings preservation
unknown 78[8]
* Data Set Management TRIM supported (limit 16 blocks)
* Deterministic read ZEROs after TRIM
Security:
Master password revision code = 65534
supported
not enabled
not locked
frozen
not expired: security count
supported: enhanced erase
2min for SECURITY ERASE UNIT. 18min for ENHANCED SECURITY ERASE UNIT.
Logical Unit WWN Device Identifier: 5001b44yyyyyyyyy
NAA : 5
IEEE OUI : 001b44
Unique ID : yyyyyyyyy
Checksum: correct
次は、diskutility での読み込みベンチマーク結果です。
おそらくですが、全領域ゼロ書き込みした状態と思われるので、SecureErase を行いました。
次は、SecureErase 後の diskutility ベンチマークの結果です。ちょっとだけ数値がアップしています。
なお、思わず盲目的に SecureErase をやってしまいましたが、blkdiscard で十分だったかもしれません。
