I have an Apacer Class4 16FB microSDHC card, for my ideos x5. Recently it has been playing up, sometimes my music app has been unable to find tracks on the card, gallery unable to find photos, etc. Its pretty much full, so I was hoping that a format would give it a fresh start.

However, I cant figure out how to succesfully format the thing!

The format function built into the phone seems to format happily - doesnt give any error - but in the end doesnt change the card.

Under disk utilities in OSX, it either seems to format happily, without giving any error, and again making no difference, or it gives a write protected error. Ditto under windows 7.

Im thinking that it could be a write protect error, but surely this shouldnt be a problem when inside the phone 'naked' without a SD - MicroSD adapter. I have been trying as well with microSD adapter, but get the same errors, and have tried toggling the write protect 'switch' on the SD adapter.

The card was bought new from notebookcity, and has been filled up with usable media in the past, I dont think it is a dodgy card (in the sense that it has less capacity than is printed on the casing).

Has anyone else experienced this before, or have any hints? Ive tried googling a number of the issues here but I'm yet to find a successful solution. The card is under warranty, but I would like to format my data before I send it off!

TIA
Nick