Flakey SD cards, needs bulk testing

[pachpict]

Recently experienced something which as always plagued Canutes and may well be related to Raspian: SD cards working or not working then working again later, no obvious reason why, when they all work on Linux/Windows computers.

Should test this by getting a batch of Canute 360s (3+) and handful of SD cards of different sizes and vintages (10+; SD/SDHC, 128MiB--64GiB, diff. makes, formatted variously to FAT16 and FAT32) and having at it. Observe which ones don't work and how frequently.

Then make necessary changes, if any can be made. If its hardware then spec. new improved components for next build.

To follow on this would be good to support exFAT/ex3/ex4/NTFS drives as well. I understand that the hardware is incapable of supporting SDXC, which is fine as no-one needs that many BRF files.