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Topic: SerialNumberOffset from STORAGE_DEVICE_DESCRIPTOR

I receive value SerialNumberOffset from STORAGE_DEVICE_DESCRIPTOR structure .
Beforehand I check on 0 (If the device has no serial number, this member is zero.)
In particular, at USB-flash! =0, but deduces nothing.
How to understand is at USB-flash value SerialNumberOffset, but it is not accessible in such a way, or it really is not present, since is empty?
. Actually at test USB-flash serial number is.