SSD Write Endurance 25nm Vs 34nm

[johnw]

265.419 TiB, 726 hours, sa177: 1/1/21827

MOVEMENT in attribute 178 raw!!!! Changed from 276 to 282. Now adding it to my reporting list:

284.151 TiB, 776 hours, sa177: 1/1/23345, sa178: 72/72/282

Average speed reported by Anvil's app has been steady at about 112MB/s.

The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

64GB Samsung 470

I wonder if SA178 is reallocated block count? Maybe the SSD shipped with a number of reallocated blocks (from Samsung internal burn-in test?) and only now have there been any new reallocated blocks? I don't know, just guessing.

Right after the above data, I upgraded to the latest version of ASU, Beta4. Before restarting endurance testing, I ran Samsung's SSD Optimization software (Magician), and also ran ASU SSD benchmark and AS-SSD.

[johnw]

284.151 TiB, 776 hours, sa177: 1/1/23345, sa178: 72/72/282

294.054 TiB, 802 hours, sa177: 1/1/24157, sa178: 71/71/290

Average speed reported by Anvil's app has been steady at about 112MB/s.

The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

64GB Samsung 470

sa178 continues to increase (raw value) and the normalized value went from 72 to 71. Interesting, maybe the flash is finally starting to wear out?

[johnw]

294.054 TiB, 802 hours, sa177: 1/1/24157, sa178: 71/71/290

302.868 TiB, 826 hours, sa177: 1/1/24873, sa178: 71/71/290

Average speed reported by Anvil's app has been steady at about 113MB/s.

The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

64GB Samsung 470

[johnw]

302.868 TiB, 826 hours, sa177: 1/1/24873, sa178: 71/71/290

312.510 TiB, 851 hours, sa177: 1/1/25623, sa178: 71/71/292

Average speed reported by Anvil's app has been steady at about 113MB/s.

The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

64GB Samsung 470

sa178 raw increase of 2 this time

[johnw]

312.510 TiB, 851 hours, sa177: 1/1/25623, sa178: 71/71/292

321.708 TiB, 876 hours, sa177: 1/1/26383, sa178: 70/70/296

Average speed reported by Anvil's app has been steady at about 113MB/s.

The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

64GB Samsung 470

sa178 raw increase of 4 this time -- still have not seen an increase by 1 (or any other odd number). It looks like the normalized value decreases by 1 for about a 10 increase in the raw value. So the raw value should be roughly 1000 when the normalized value reaches 1. If that is 1000 erase blocks of 512KiB each, then we are looking at roughly 512MiB of reallocated flash, or roughly 0.8% of 64GiB on board. Seems plausible to reserve a little less than 1% of flash for reallocated blocks.

[johnw]

321.708 TiB, 876 hours, sa177: 1/1/26383, sa178: 70/70/296

330.672 TiB, 899 hours, sa177: 1/1/27126, sa178: 70/70/302

Average speed reported by Anvil's app has been steady at about 113MB/s.

The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

64GB Samsung 470

By the way, I checked the SMART attributes last night, at 884 hours, and sa178 raw was at 300.

[johnw]

330.672 TiB, 899 hours, sa177: 1/1/27126, sa178: 70/70/302

340.001 TiB, 924 hours, sa177: 1/1/27887, sa178: 70/70/304

Average speed reported by Anvil's app has been steady at about 113MB/s.

The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

64GB Samsung 470