I just formatted my 4GB USB disk in BT4. For some reason, now it has a very slow data transfer rate. Before it was blazing fast, bu now it takes a long time... I've reformatted it but the same result. Here is the format instruction I followed:

fdisk /dev/sdb
[deleted all partitions with d]
[p to confirm]
[n to add partition] > p > 1 > enter > enter
[t to set filetype] b for FAT32
[w to write]
mkfs -t ext2 /dev/sdb1
fsck -f -y /dev/sdb1

USB disk works fine, just very slow data transfer. If you know why and how to fix it, please help. I'll be using this USB with windows mainly (not sure if that'd change anything, but I thought I'd mention). Thank you.