I have a request for Samsung 840 EVO SSD owners. In order to confirm my observation that with normal usage patterns the write amplification factor on these drives appears to be close to or possibly even lower than 1.0x, I need data from the community.
All I need is a screenshot or dump of the main SMART attributes with any kind of SMART monitoring program, like for example CrystalDiskInfo (on Windows). More specifically, I will be using these data (Samsung 830 pictured here):
In this case, the Wear Leveling Count is 179 (P/E cycles).
Since the raw NAND capacity of this drive is 128 GiB, the calculated amount of writes to the NAND is 179 × 128 = 22912 GiB = 22.375 TiB
Host Writes are already there, but to confirm (or be more precise) one could use the LBA Written data. Each LBA is 512 bytes, so that would be 15651045550 × 512 ÷ (1024^3) = 7463 GiB = 7.288 TiB
The lifetime write amplification factor for this SSD is thus 22.375 ÷ 7.288 = 3.07x, which is generally normal for Samsung 830 SSDs used with a light usage pattern (which counterintuitively tends to increase the write amplification over time).
My hypothesis is that on Samsung 840 EVO SSDs (or the upcoming 850 EVO) the Turbowrite emulated-SLC cache helps decreasing the write amplification, bringing it below 1.0x in certain cases, like what happens on the SanDisk Ultra II TLC SSD and its nCache 2.0 SLC buffer.
I need data from drives normally used, not review samples or anyway ones that have been secure erased (which would increase the wear leveling count without increasing host writes).
All I need is a screenshot or dump of the main SMART attributes with any kind of SMART monitoring program, like for example CrystalDiskInfo (on Windows). More specifically, I will be using these data (Samsung 830 pictured here):
In this case, the Wear Leveling Count is 179 (P/E cycles).
Since the raw NAND capacity of this drive is 128 GiB, the calculated amount of writes to the NAND is 179 × 128 = 22912 GiB = 22.375 TiB
Host Writes are already there, but to confirm (or be more precise) one could use the LBA Written data. Each LBA is 512 bytes, so that would be 15651045550 × 512 ÷ (1024^3) = 7463 GiB = 7.288 TiB
The lifetime write amplification factor for this SSD is thus 22.375 ÷ 7.288 = 3.07x, which is generally normal for Samsung 830 SSDs used with a light usage pattern (which counterintuitively tends to increase the write amplification over time).
My hypothesis is that on Samsung 840 EVO SSDs (or the upcoming 850 EVO) the Turbowrite emulated-SLC cache helps decreasing the write amplification, bringing it below 1.0x in certain cases, like what happens on the SanDisk Ultra II TLC SSD and its nCache 2.0 SLC buffer.
I need data from drives normally used, not review samples or anyway ones that have been secure erased (which would increase the wear leveling count without increasing host writes).