But it's not really 4 TB, isn't it ? More like 3.8 ... For some reason Corsair has smaller capacity than the rest of the M.2 NVMe products... 480, 960, 1920 .. instead of 512, 1024, 2048

wavetrex:

But it's not really 4 TB, isn't it ? More like 3.8 ... For some reason Corsair has smaller capacity than the rest of the M.2 NVMe products... 480, 960, 1920 .. instead of 512, 1024, 2048

My MP600 1TB formats to 930GB. Could be for added caching? Or redundancy? Does seem weird now you mentioned it.

On MP510 line they are actually mentioning this lower capacity. On MP600 it's just round numbers, but in reality still lower than the competition. It helps with performance to have that spare area, but why not give the customer this choice ? I'm sure they were losing a lot of sales because people look at offer A and offer B, and offer A (Corsair) is smaller in size, so they go with "B" (anything else in the same price range), ... so instead they switch to plain lying: "1 TB" for MP600 when in reality it's still 960 GB ... (I'm sure there's a fine-print mention/disclaimer somewhere on the box, which nobody actually notices...) -- p.s. The "formatted" size lowers the number even more, as these sizes are expressed in 1000000000 bytes (GB), while Windows reports in GiBiBytes ( 1024 x 1024 x 1024 = 1073741824 bytes )

CPC_RedDawn:

My MP600 1TB formats to 930GB. Could be for added caching? Or redundancy?

The Corsair has a bigger static over-provisioning, I like! SSD Over-Provisioning And Its Benefits https://www.seagate.com/br/pt/tech-insights/ssd-over-provisioning-benefits-master-ti/ From the end of this link https://www.dell.com/support/article/pt-br/sln156899/hard-drive-why-do-solid-state-devices-ssd-wear-out?lang=en "There are two types of wear leveling, dynamic and static. The dynamic wear algorithm guarantees that data program and erase cycles will be evenly distributed throughout all the blocks within the NAND flash. The algorithm is dynamic because it is executed every time the data in the write buffer of the drive is flushed and written to flash memory. Dynamic wear leveling alone cannot insure that all blocks are being wear-leveled at the same rate. There is also the special case when data is written and stored in flash for long periods of time or indefinitely. While other blocks are actively being swapped, erased and pooled, these blocks remain inactive in the wear-leveling process. To insure that all blocks are being wear-leveled at the same rate, a secondary wear-leveling algorithm called static wear leveling is deployed. Static wear leveling addresses the blocks that are inactive and have data stored in them."

wavetrex:

But it's not really 4 TB, isn't it ? More like 3.8 ... For some reason Corsair has smaller capacity than the rest of the M.2 NVMe products... 480, 960, 1920 .. instead of 512, 1024, 2048

This happen to all SSD / HDD, the actual usable size is always less than the stated size due to various reason mentioned before.

chanw4:

This happen to all SSD / HDD, the actual usable size is always less than the stated size due to various reason mentioned before.

No, you don't get it. Corsair SSDs have an extra reduction beside that TB / TiBi calculation. They probably have some static over-provisioning (spare area) which cannot be "recovered". Read @Pictus post above.

wavetrex:

No, you don't get it. Corsair SSDs have an extra reduction beside that TB / TiBi calculation. They probably have some static over-provisioning (spare area) which cannot be "recovered". Read @Pictus post above.

All SSD and HDD do that, my 1TB SSD is only 930GB, my 250GB SSD is only 230GB, my 1 TB HDD is only 930GB, my 8TB HDD is only 7.2TB. All of them from different brands