so I currently have two SSDs in operation:
Transcend MTE220S 1TB, Gen. 3 (TS1TMTE220S)
(specs: read 3400MB/s, write 1900MB/s, SLC-Cached, 2.2PB TBW) transcend link
Lexar Professional NM800 1TB, Gen. 4 (LNM800X001T-RNNNG)
( specs: read 7400MB/s, write 5800MB/s, 3PB TBW) lexar link
No doubt the Lexar SSD is fast, but I am very concerned about the lifespan.
After almost a year of use (6683 hours) the Transcend shows:
- Health: 30%
- Read (total): 789068 GB → about 770TB
- Write (total): 787477 GB → about 760TB
- SMART data excerpt
- Data Units Read: 0x0000000062A23398 (raw hex) → 1654797208 (decimal)
- Data Units Written: 0x00000000626F498A (raw hex) → 1651460490 (decimal)
- Host Read Commands: 0x00000001B8B843B0 (raw hex) → 7394050992 (decimal)
- Host Write Commands: 0x00000001B21C7698 (raw hex) → 7283177112 (decimal)
Shouldn’t 760TB written result in just 35% (760TB/2.2PB) of the total TBW used instead of 70?
After just a few weeks of use (290 hours) the Lexar shows:
- Health: 95%
- Read (total): 80036 GB → about 78TB
- Write (total): 68515 GB → about 67TB
- SMART data excerpt
- Data Units Read: 0x000000000A011C5F (raw hex) → 167844959 (decimal)
- Data Units Written: 0x0000000008906372 (raw hex) → 143680370 (decimal)
- Host Read Commands: 0x000000000FCE3EFA (raw hex) → 265174778 (decimal)
- Host Write Commands: 0x000000000979F7C3 (raw hex) → 158988227 (decimal)
Shouldn’t 67TB written result in just 2.2% (67TB/3PB) of the total TBW used so far, instead of 5%?
What exactly do those “Data Units Read/Written” and “Host Read/Write Commands” counts tell me?
Interestingly, if I sum up the totals of both “Read” and “Write” respectively I end up with 1.53PB for the Transcend and 0.145PB for the Lexar drive. 1,53PB/2,2PB = 69.5% and for the Lexar 0.145PB/3PB = 4.8%. Those two numbers come fairly close to what is reported as wear looking at the reported percentages of 30% and 95% as overall health.
Do both, reads and writes count against the proclaimed TBW? If so, why is it called “Total Bytes Written”?
From your experience, is the Lexar drive deteriorating too fast?
Thanks a lot in advance!