I'm trying to create a storage partition on my bootable Linux flash drive (see my other question on Super User). I formatted my provisional partition FAT32 using GParted. The Mac saw it just fine, although I forgot to look whether it could read the test data on the partition.
But when I went to reformat the partition, it came back with "MediaKit reports no such partition". When I tried using the Partition dialog, it said "Couldn't modify partition map" instead.
Any idea what could be causing this or how to fix it, preferably without losing my Linux partition?