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The idea about reconstructing the write count is simple: the drive does not need actual "transaction sequence numbers" like a multi-user database because there is only one controller accessing the array. The controller only needs to distinguish blocks from "all previous sessions" and blocks being "written now" in the current session, since it need only find the tail of the log at start-up. So there is no need to actually store an incrementing "write sequence number" in the array, only some way to find the tail of the log, which could be a "session number" instead, incremented only on power-up.

A band about 10% of the drive's capacity in size? 256 (drive size) / 273 (image size) is about .9377, so a ~7% pad area is expected to exist in the NAND array. That dark band may be the tail of the log, possibly with the log pointers and other very useful information in it somewhere. Are there any valid LBA pages in that area?

In reply to Re^6: Adding cols to 3d arrays - syntax by jcb
in thread Adding cols to 3d arrays - syntax by peterrowse

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