Other Help Topics :: DSL can't read my memory card

There are some problems the way some devices are factory formatted iirc. You can search around for others' experiences if you want.

I see the device come up as sdb in dmesg, but I can't seem to fdisk it.
I try:
sudo fdisk /dev/sdb

but get:
Unable to read /dev/sdb

Wasn't it sda in your first post?

If I boot, and plug in my thumb drive, it comes up as sda, then if I switch to the card reader, it becomes sdb.

original here.