Any question answered...

whats the difference between gxp bb cups and shimano external bb cups?

22mm non drive side instead of 24mm

Think it’s the way the bearings load (if that’s the right term) and also the axle size (Shimano is 24mm on both sides GXP is 24mm - 22mm)

Edit- answered after Phil !

ah ok. so the ambrosio crankset with a 24mm spindle must require a shimano hollowtech 2?

cheap square taper single speed (1x) crank with road Q factor and 34t chainring, does this exist?

Can't help you with the specifics but probably. Not much else other than Sram use GXP

Use a compact, minus the outer chainring?

Why don't you just use a cheap square taper road crank with NW?

which one

Any old one from ebay

Edit: Old shimano 600 are nice

Spa will probably sell you a TD-2 crank + 110 bcd 34t ring

ta! any back ones apart from Spa @Heldring .. nothing against Spa, they

ta! any back ones apart from Spa @Heldring .. nothing against Spa, they are my plan B

Yeah why not.

Why square taper? who do you think you are? me?

Gave it a go and it only got so far before saying 'bad count' then just hung. All the tools I've been using seem to get up to a point but none seem to say what exactly is wrong or be able to finish scanning. I think it may be a write-off.

@J0nathan, Bad Count sounds like dodgey sectors. It might be upthread so sorry but when you ran chkdsk did it take the disc offline to repair it? That should have logged something in your event log.
If it's physically damaged you often a repeated clicking sound?

chkdsk was the same thing - it initially said it didn't work and to try again, then every time thereafter it was just hanging. No clicking and don't suspect physical/impact damage - it hasn't moved in years and there's no risk of water damage. That's what initially made me feel confident that some simple dodgy file or directory change could be undone and it would be fixed. What I think did it is writing a .rar file of some files that are on the disk to the disk itself - I meant to save it to the desktop. Might be unrelated, but that was the last thing I did before noticing all the problems. I'm currently running a Western Digital 'LifeGuard' diagnostics scan on it - it's been nearly 1.5hrs with 15mins to go. Will see what that tells me.

^That hasn't work either - just says it's 'passed' lol.

What file system is it?

Anyone got a kryptonite key re cut somewhere in London?
And no, I don’t have the serial number

Well that sucks. Not sure whether to run the repair or whether that risks making my chances of a fuller recovery worse if I take it to a specialist.

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I'm not totally sure but as I recall the thing to do in this situation is to take an image of the drive ASAP as continuing to use it can degrade it further. Have you tried that?

I probably should, but I think I'm going to admit defeat and see if I can find somewhere that will look at it and quote me for a recovery.

Probably the safest option if you can't lose the stuff on there!