I'm a little confused as to how Samsung defines "over provisioning".
According to Samsung Magician ...
AIUI, a 1TB (= 931GiB) drive created from 1TiB of NAND flash is inherently overprovisioned by7% 9%.This area is unavailable to the user and is used exclusively by the firmware.
EDIT: That should be 9%, not 7%.
The result of the procedure is that the original 1TB NTFS partition is shrunk to 838GiB, and the NTFS metadata adjusted accordingly. The OP area is now reported as an unallocated space of 93GiB.
I presume that the reference to "an available space" is actually an error and is meant to be "unavailable space". This is where it becomes confusing for me. AISI, this OP space is still available to the user, however it is unallocated. That's not the same thing. I was expecting that Samsung's tool would shrink the reported capacity of the drive to 900GB and hide the additional OP space from the OS, just as it hides the initial 9% of OP space.
So how does this "logical" overprovisioning work? Is the additional OP space simply TRIM-ed, and is the drive's firmware then free to do anything it likes with these blocks?
According to Samsung Magician ...
Over Provisioning - Allocates a certain capacity of the SSD to an available space to improve the performance and lifetime of the SSD.
AIUI, a 1TB (= 931GiB) drive created from 1TiB of NAND flash is inherently overprovisioned by
EDIT: That should be 9%, not 7%.
- (1TiB - 1TB) / 1TiB x 100 = 9%
Code:
OP Setting for C:
Disk 1 | Total Capacity 931GB
OP Setting Partition Over Provisioning (Unallocated)
C:Boot_Disc OP
838GB NTFS 93GB Unallocated
The result of the procedure is that the original 1TB NTFS partition is shrunk to 838GiB, and the NTFS metadata adjusted accordingly. The OP area is now reported as an unallocated space of 93GiB.
I presume that the reference to "an available space" is actually an error and is meant to be "unavailable space". This is where it becomes confusing for me. AISI, this OP space is still available to the user, however it is unallocated. That's not the same thing. I was expecting that Samsung's tool would shrink the reported capacity of the drive to 900GB and hide the additional OP space from the OS, just as it hides the initial 9% of OP space.
So how does this "logical" overprovisioning work? Is the additional OP space simply TRIM-ed, and is the drive's firmware then free to do anything it likes with these blocks?
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