Re:Modern HDDs have gotten somewhat better
by qilo on Thursday June 23, 2022 @08:08AM
(#31847900)
For disks with sectors of 4096 bytes, the formula is the same except the constants are accordingly 8 times smaller.
Regarding sectors of 520 bytes, usable bytes are still 512. Quote from the above referenced document:
> HDDs formatted with T10 PI (Protection Information) have 8 bytes added to the end of each sector. However, the user usable sector size will remain at 512 bytes or 4096 bytes. The 8 bytes of PI will increase the overhead of the disk sector density similar to overhead of ECC bytes in a given sector.
Regarding sectors of 520 bytes, usable bytes are still 512. Quote from the above referenced document:
> HDDs formatted with T10 PI (Protection Information) have 8 bytes added to the end of each sector. However, the user usable sector size will remain at 512 bytes or 4096 bytes. The 8 bytes of PI will increase the overhead of the disk sector density similar to overhead of ECC bytes in a given sector.