I am not a programmer, I am a 'user'. I have bought a FonePad and added a 32GB SDHC card, naively thinking I could use it to store the maps I will need on a storage-hungry navigation software.

However, I find I cannot rename the device from Removable, I get the message 'Permission Denied'. Same result when I try to create a subfolder. Same result if I try using a utility like SDCard Manager or Card Manager HD.

Coming from a Windows world, I am just completely lost.

Take SDCard Manager for example: when running it says that it has \*Storage -- Modify or delete the contents of your SD card. I note that SD card is the 'built-in' device.