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7/18/2025, 8:28:32 PM
>>105948662
>must mean the controller recognizes and understands GPT
No, but it knows exactly which regions are unused because the OS issues discard commands for them (on modern filesystems, that is). That unused 1GB guarantees that nothing wrote to that region, and the controller can allocate it in case of emergency to substitute a dying region even if your filesystems are misconfigured or full or don't issue discards.
Overprovisioning does indeed make this practice obsolete, but how many drives are overprovisioned? If your SSD is 256/512/1024 GB then there is exactly zero excess capacity. It would need to be less than a power of two capacity, such as pic related.
>must mean the controller recognizes and understands GPT
No, but it knows exactly which regions are unused because the OS issues discard commands for them (on modern filesystems, that is). That unused 1GB guarantees that nothing wrote to that region, and the controller can allocate it in case of emergency to substitute a dying region even if your filesystems are misconfigured or full or don't issue discards.
Overprovisioning does indeed make this practice obsolete, but how many drives are overprovisioned? If your SSD is 256/512/1024 GB then there is exactly zero excess capacity. It would need to be less than a power of two capacity, such as pic related.
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