SSD SMART - going bad?

Soldato
Joined
16 Jun 2009
Posts
2,566
Location
Bucks
Hi,

I've had a Crucial M4 64GB as my Windows boot drive since 2012.
The other day I got a warning in the BIOS to 'backup and replace' as the SMART data indicated something bad.

Crystaldisk shows 93% 'percent lifetime used' and a red dot by 'raw read error rate'.

It's the 93% used which concerns me! Is that to be expected?

Here's the start of the report from Crystaldisk:
----------------------------------------------------------------------------
CrystalDiskInfo 7.0.0 (C) 2008-2016 hiyohiyo
Crystal Dew World : http://crystalmark.info/
----------------------------------------------------------------------------

OS : Windows 10 Professional [10.0 Build 10586] (x64)
Date : 2016/07/07 17:57:13

-- Controller Map ----------------------------------------------------------
+ Standard Dual Channel PCI IDE Controller [ATA]
+ ATA Channel 0 (0)
- HL-DT-ST DVDRAM GSA-4167B ATA Device
- ATA Channel 1 (1)
+ Standard Dual Channel PCI IDE Controller [ATA]
- M4-CT064 M4SSD2 SCSI Disk Device
- WDC WD25 00AAJS-55B4A SCSI Disk Device
+ Standard Dual Channel PCI IDE Controller [ATA]
- SanDisk SDSSDA240G SCSI Disk Device
- Microsoft Storage Spaces Controller [SCSI]

-- Disk List ---------------------------------------------------------------
(1) M4-CT064M4SSD2 : 64.0 GB [0/0/0, pd1] - mi
(2) WDC WD2500AAJS-55B4A0 : 250.0 GB [1/0/1, pd1] - wd
(3) SanDisk SDSSDA240G : 240.0 GB [2/1/1, pd1] - sd

----------------------------------------------------------------------------
(1) M4-CT064M4SSD2
----------------------------------------------------------------------------
Model : M4-CT064M4SSD2
Firmware : 0309
Serial Number : 00000000120409038263
Disk Size : 64.0 GB (8.4/64.0/64.0/64.0)
Buffer Size : Unknown
Queue Depth : 32
# of Sectors : 125045424
Rotation Rate : ---- (SSD)
Interface : Serial ATA
Major Version : ACS-2
Minor Version : ATA8-ACS version 6
Transfer Mode : SATA/300 | SATA/600
Power On Hours : 6266 hours
Power On Count : 3347 count
Wear Level Count : 226
Temperature : Unknown
Health Status : Bad (93 %)
Features : S.M.A.R.T., APM, 48bit LBA, NCQ, TRIM
APM Level : 00FEh [ON]
AAM Level : ----
Drive Letter : C:

-- S.M.A.R.T. --------------------------------------------------------------
ID Cur Wor Thr RawValues(6) Attribute Name
01 __9 __9 _50 00000000005C Raw Read Error Rate
05 _99 _99 _10 000000023800 Reallocated NAND Blocks
09 100 100 __1 00000000187A Power On Hours
0C 100 100 __1 000000000D13 Power Cycle Count
AA _99 _99 _10 000000000047 Reserved Block Count
AB 100 100 __1 00000000019A Program Fail Count
AC 100 100 __1 000000000000 Erase Fail Count
AD _93 _93 _10 0000000000E2 Average Block-Erase Count
AE 100 100 __1 000000000000 Unexpected Power Loss Count
B5 100 100 __1 0975015C0818 Unaligned Access Count
B7 100 100 __1 000000000000 SATA Interface Downshift
B8 100 100 _50 000000000000 Error Correction Count
BB 100 100 __1 00000000039A Reported Uncorrectable Errors
BC 100 100 __1 000000000000 Command Timeout Count
BD 100 100 __1 000000000031 Factory Bad Block Count
C2 100 100 __0 000000000000 Temperature
C3 100 100 __1 000000000000 Cumulative ECC Bit Correction Count
C4 100 100 __1 000000000047 Reallocation Event Count
C5 100 100 __1 000000000000 Current Pending Sector Count
C6 100 100 __1 000000000000 Smart Off-line Scan Uncorrectable Error Count
C7 100 100 __1 000000000006 Ultra DMA CRC Error Rate
CA _93 _93 __1 000000000007 Percent Lifetime Used
CE 100 100 __1 00000000019A Write Error Rate
 
Last edited:
Associate
Joined
24 Mar 2011
Posts
623
Location
Cambridgeshire
Percent lifetime used is just worded poorly. It means it's 7% used, based on the average P/E cycle of the NAND chips (~226 of 3000). So that figure isn't a concern.

The read error rate is a concern though and implies the drives having trouble reading the data back. You could try swapping the cable on the off chance, but the likelihood is the drive is in bad shape. You probably want to back it up and take it out of service IMO.
 
Associate
Joined
28 May 2015
Posts
159
Hey there, Mark.

Basically I agree with @DarkBahamut, you should backup your data right away if you haven't done so already. However, changing the cables probably won't do you any good. Even in the odd chance that the cable or the port might be faulty, you shouldn't get those readings in your SMART data.

I'd advise you to RMA it if it's still under warranty.

Cheers!
Boogieman_WD
 
Soldato
OP
Joined
16 Jun 2009
Posts
2,566
Location
Bucks
Hi,

I found this topic on a Crucial forum which seems to say that Raw Read Error Rate isn't a concern.



I got the trial version of HDtune and it has a 'data' column which Crystaldisk omits, and this looks to give a bit of detail about the items. Notably the Raw Read Error Rate which has another number by it in excess of the threshold, for what that's worth in light of the above.

Interestingly Crystaldisk lists item (CA) as 'percent lifetime used' 93% but HDtune shows it as 'SSD life remaining' and doesn't flag it up.

But HDtune does flag up a few more items than Crystaldisk and looking at the 'data' column these do look bad.

Oh man! I'd have thought SMART would be a standard set of data, but it seems every manufacturer lists different sets of numbers and means different things by them!

New SSD is on order.
 
Last edited:
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