Sorry for bumping this 4 years old thread (wow, almost to the day!) but guess what? I have a similar question

Mine is actually simpler. I have only one data partition on my SD card (the other one being swap) and I can rename it via File Manager and when I do, the desktop can see the new label. The trouble is, when I change the label on the desktop, the N900 will still show the SD card under the old name I last set up by File Manager.

It would not be such a problem, except I want to use a dash in the name and File Manager does not let me.

So what exactly happens when one renames a memory card in Filer Manager? Is the name cached somewhere and the disk label not honoured?