65536 hidden sectors in WD USB drives after SATA conversion
Today, 17:00
The attached screenshot is from this MRT video which explains how to access a WD USB drive in SATA mode:
https://www.youtube.com/embed/kZK9ltcHWcs
The capacity reported via SATA (not USB) is 3906963632 sectors. This is 65536 sectors less than the IDEMA standard capacity, 3907029168. I have seen this behaviour in other threads. In those threads an examination of module 0x02 reveals that all 5 capacity parameters reflect the full IDEMA capacity, not the actual reported capacity. This same reported capacity is visible in the drive's Identify Device info sector when accessed via Linux, so it is not some artifact of PC3K or MRT.
The capacity reported via the native USB interface is even less by a few thousand sectors.
In another thread the difference was 65535 sectors rather than 65536.
What is going on? Where is this capacity value coming from?
https://www.youtube.com/embed/kZK9ltcHWcs
The capacity reported via SATA (not USB) is 3906963632 sectors. This is 65536 sectors less than the IDEMA standard capacity, 3907029168. I have seen this behaviour in other threads. In those threads an examination of module 0x02 reveals that all 5 capacity parameters reflect the full IDEMA capacity, not the actual reported capacity. This same reported capacity is visible in the drive's Identify Device info sector when accessed via Linux, so it is not some artifact of PC3K or MRT.
The capacity reported via the native USB interface is even less by a few thousand sectors.
In another thread the difference was 65535 sectors rather than 65536.
What is going on? Where is this capacity value coming from?
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