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The message was : Can't find cluster size.

But I don't really understand why you are suggesting all these steps which read and analyze the disk. We know that any instruction to read any sector/cluster/whatever will produce the same nonsense (as per my first post). What I do not know is whether ...

Hi Fiona, thanks for the reply.
As I said Analyze displays the message about 0xAA55. That is having selected FAT. If I select partition type None, Analyze gives a 'partition' as follows:
P Unknown from 0 0 1 to 1022 97 38.

Again quick search, and also deeper search, give an empty partition table ...

Well the Analyze returns "Partition sector doesn't have the end mark 0xAA55"

Quick Search produces no entries in the table.

I have a 8GB memory stick, pen drive, whatever, which can not be read.
Under Linux I have tried to read the sectors by both the following
od -Ax -tx1 /dev/sdc >hexdump.txt to give a text file with the first 1M bytes in readable hex
dd if=/dev/sdc of=dump.bin to make an exact copy of the first few MB ...