OK, so I think I managed to get the initial problem I had installing RockBox sorted. It certainly worked for a little while (Sansa 8GB Clip +) using a 32GB memory card with about a dozen albums saved to the external micro SD.
I have a 64GB micro SD with most of my music collection saved. I have formatted the SD in FAT32 (using a gizmo on the web that someone helpfully pointed me towards). Inserted card into Sansa player. A number of problems have since happened:
1. When updating the database the Sansa seemed to struggle. It found the tracks on the 64GB card, but it also kept some of the information from the 32GB card which I had taken out (to replace with 64GB card). For example, when I go to database > album there were a couple of albums still listed which I know were not on the 64GB card. (There is nothing on the internal memory). I have double and triple checked this. It seems like the database did some kind of partial refresh, but didn't properly purge all of the previous info, so it was kinda mixing up the metadata from the previous card with the stuff on the new card, if that makes sense?
2. When trying to access the tracks on the external card via the "Files" option rather than the "Database" option, I get the message "DIr Buffer Is Full". It will still let me access the tracks but is only showing a maximum of 1000 tracks (and there are considerably more tracks on the SD card). All my files are MP3. I have copied them across from MediaMonkey to the SD card in Windows 10 as a single list of tracks - could this be the problem? D'oh... should've read the manual first! Ignore this one, have re-set the max file within the Player so this is solved, and doesn't seem to be related to the database error message as i'mstill getting that one...
3. ...back to the Database problems... when I select Database from the main menu (rather than going to try and update it via the context menu) it always says "Database is not ready, initialise now?" (despite me having tried to initialise/update already via the context menu). When I press select I get the following error message:
Data abort at 300485B (...possibly something else but the text is cut off by the edge of the screen...)
FSR 0x8
(domain 0, fault
address 0x745F6573
pc: 300485B0 sp: 300B1B (....again, something else here but cant read the rest of the line of text)
bt end
4. Just also noticed, in case its relevant, that when I reboot (or press select after getting the error message above) it quickly flashes up with boot 4.00 (I think - its very fast) before the logo screen which says version 3.13
Hpoing someone can help me please!
Oh yeah, just also to say that I have gone back to the 32GB card and although that (seemed to) work fine first time round, I am getting the same error messages now with this card as well as the 64GB one. Think I may have messed up the Sansa good and proper here!