Как отформатировать флешку ?

Команда
fdisk -l
выдает :
Disk /dev/sdb: 521 MB, 521666560 bytes
17 heads, 59 sectors/track, 1015 cylinders
Units = cylinders of 1003 * 512 = 513536 bytes
Disk /dev/sdb doesn't contain a valid partition table

Я не могу ее отформатировать
Например :
mke2fs -j /dev/sdb

Выдает :
e2fs 1.38 (30-Jun-2005)
/dev/sdb is entire device, not just one partition!
Proceed anyway? (y,n) y
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
127512 inodes, 509440 blocks
25472 blocks (5.00%) reserved for the super user
First data block=1
63 block groups
8192 blocks per group, 8192 fragments per group
2024 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 24 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

После этого ничего не могу скопировать на флешку