03-27-2014 03:15 AM
I recently purchased a Sandisk Extreme II SSD and I would like to know if there is a SMART parameter specification sheet for this drive available somewhere as other SSD manufacturers often provide. I'm trying to write an SSD monitoring application for Linux and for best results it would be useful for me to know what all SMART parameters for this drive mean exactly. Thanks in advance.
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04-02-2014 09:44 PM
Good luck with that, I can't find a comprehensive datasheet for the SanDisk Extreme II SSD, such as those provided by Intel for their SSDs.
I imagine this won't help much, but the SanDisk SSD Toolbox will at least display the SMART attributes SanDisk makes available to the public.
Other programs that display SMART atttributes show more than the SanDisk Toolbox displays, but if they are valid or not, who knows?
04-14-2014 10:28 AM - edited 04-14-2014 10:42 AM
Well, of course I would like to know what the attributes not listed by the Sandisk toolbox are (which CrystalDiskInfo lists as "vendor specific")
I might have identified two, but I have no clue yet about most of them.
AD = Average NAND P/E count (although A6 could be too, need more writes to tell)
E9 = Total NAND Writes in GiB (which is neat as it allows to calculate the drive's write amplification together with Total Host Writes)
04-18-2014 08:55 PM - edited 04-18-2014 08:59 PM
With a bit of research I started filling up this SMART attribute name list for the Sandisk Extreme II SSD with Marvell 9178-based controller. It appears that attributes are grouped in a logical manner, which should help figuring out what they mean. The [?] symbol denotes that SanDisk does not provide information about those attributes in the ToolBox or anywhere else, and that therefore they are my own's best guess through observation.
Generic SMART parameters
05 - Retired Block Count [1 block = 4 MB]
Interface-level counters? (basing on SMART parameters for Marvell-based drives from other manufacturers)
Usage statistics - Internal
Usage statistics - Host
Micron/Crucial provide something like this, which helps big time:
Since they're based on the same controller, many of these parameters are exactly the same. However we cannot be sure until SanDisk confirms and/or provides similar documentation. Please help!
05-21-2014 05:40 AM - edited 05-21-2014 05:47 AM
Is the SMART parameter A8 related with the drive's lifetime Write Amplification Factor?
I'm monitoring that as well (by dividing NAND Writes by Host writes over time as they increase) and I found out that their curves are strongly correlated to each other:
06-03-2014 02:00 AM - edited 06-03-2014 02:00 AM
The new Sandisk Dashboard software (here: http://kb.sandisk.com/app/answers/detail/a_id/15108 ) provides all the information I needed under the SMART diagnostics tab. Thanks Sandisk! Although it would be nice if this information was more readily available (ie available directly from SMART parameter / the SSD firmware?):
Sandisk Extreme II (firmware: R1311)