On 02-10-18 03:44, bob prohaska wrote:
> Is there a program that can interrogate a flash storage device to
> determine how many spare blocks remain?

Any S.M.A.R.T. diagnostic tool will tell you spare blocks remaining. The
different parameters have fixed IDs, spare blocks remaining is ID=251
(0xFB) or sometimes 232 (0xE8), see https://en.wikipedia.org/wiki/S.M.A.R.T.

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