How long will the SanDisk Ultra Plus last? When will it run out of write cycles?
SanDisk has taken the easy way and specified the endurance as "more than 80 TBW". Is this a marketing trick to differentiate the Ultra Plus and the Extreme II, both using the same NANDs?
The SanDisk Ultra Plus passed the endurance test with flying colors!
SanDisk specified the life span to more than 80TBW. It came close to 170TiBW before showing a clear sign of failure.
Drive has reported data checksum error on Oct 27 at 23:29.
The file system has been checked for inconsistencies and verified to be ok. I will backtrack the smart data to see if it can provide additional information.
Up next is a simple SSD data retention test. I will recalculate checksums and leave the drive unpowered for about 2 weeks to see if the NAND is capable of keeping the data.
Preliminary Data - Test is Running
TiB Written 169.92
Estimated Cycles 6344.05
Hours Online 1473.24
Endurance Cycles are estimated as NAND/Host writes reported by S.M.A.R.T. divided by the SSD capacity. TiB Written is pure user data. Hours Online include read/write/smart/overhead.
Last two reported
Please note that this unit is heavily stressed and in steady state most of the time.
Started at Aug 27. Last update Oct 27 23:29.
The SanDisk Ultra Plus makes a solid impression with very consistant performance in steady state. When it comes to reads and random writes the SanDisk performs slightly better than the Intel 520. It looks like a drive that would perform rather well in a RAID setup.
SanDisk+Toshiba 19nm eX2 ABL MLC NAND
S.M.A.R.T. Data Logging
The health of the SanDisk Ultra Plus is monitored by reading the SMART data throughout the test.
The latest firmware X2306RL made a few changes to the reported SMART data. The Media Wear Indicator started to report something that I believe is NAND writes. It reacted in the same way as the Intel 520 when the random write algorithm was changed at 35TBW.
This disk should last more than 80 TB of writes according to SanDisk. I assume this is user data, not NAND writes.
I'm not sure of what to make of the Head Amplitude parameter. It trails the MWI/NAND writes quite nicely. Any ideas?!
Device Model: SanDisk SDSSDH2064G
Serial Number: 13073#######
LU WWN Device Id: 5 001b44 97#######
Firmware Version: X2306RL
User Capacity: 64,023,257,088 bytes [64.0 GB]
Sector Size: 512 bytes logical/physical
Reviews of the SanDisk Ultra Plus
SanDisk Ultra Plus Solid State Drive Review "SanDisk Ultra Plus is a solid state drive with a platform that we are not yet familiar with: it is built on a four-channel Marvell SS889175 controller with 19 nm eX2 ABL MLC NAND manufactured by SanDisk. Will this combination prove to be a winner especially considering it very attractive price?" Ilya Gavrichenkov, Xbit laboratories — Read it »SanDisk Ultra Plus 256GB SSD Review "The SanDisk Ultra Plus features SanDisk's proprietary eX2 ABL MLC NAND with nCache technology. This technique creates a SLC layer to help boost write performance and enhance endurance. The SSD also features a four channel Marvel 88SS9175 controller and 128MB of DRAM cache." Hugh Briggs, HardOCP — Read it »
Feedback and Comments on SanDisk Ultra Plus
Is this really normal?
No. The tests preformed here must not be confused with normal use. They are designed to stress SSDs and simulate a really busy environment.
Normal workstation use would be more like 10-20GB written daily.
Don't worry. All drives tested here are perfectly suited for normal use. No doubt. This SSD test is more about how they fail. We want to see warnings of imminent failure, not just a sudden death.
How About Data Retention?
The term Data Retention refers to how long the data preserved is if the SSD is left unpowered. The plan is to test data retention once a SSD reaches extreme TBW. Please be carefull with your data and with SSDs that have outlived their specifications.
Why Test Smaller SSDs?
They use fewer NAND circuits and will wear out faster. Once we know the write endurance of these units, it'll be easy to estimate the equivalent numbers for the larger units.
The SSD Endurance Test Is an Ongoing Experiment to Find Out Just How Far Todays Consumer Level SSDs Can Be Pushed In Terms of NAND Write Endurance.