Ubu18.04 non riesco a montare hard disk esterno da 250 Gb formattato FAT (dos)

Questo è l'output di sudo fdisk -l

Disk /dev/sda: 232,9 GiB, 250059350016 bytes, 488397168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x443f4c4c

Dispositivo Avvio     Start      Fine   Settori   Size Id Tipo
/dev/sda1   *          2048    206847    204800   100M  7 HPFS/NTFS/exFAT
/dev/sda2            206848 330755419 330548572 157,6G  7 HPFS/NTFS/exFAT
/dev/sda3         330756094 488396799 157640706  75,2G  5 Esteso
/dev/sda5         330756096 480010239 149254144  71,2G 83 Linux
/dev/sda6         480012288 488396799   8384512     4G 82 Linux swap / Solaris

Disk /dev/sdb: 223,6 GiB, 240057409536 bytes, 468862128 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 33553920 bytes
Disklabel type: dos
Disk identifier: 0xd7d2b960

non riesco a montare Disk /dev/sdb E' possibile ricevere aiuto

Grazie