ubuntu@ubuntu:/dev$ sudo file -s /dev/sda
/dev/sda: x86 boot sector; partition 1: ID=0x1c, starthead 32, startsector 2048, 3903488 sectors; partition 2: ID=0x82, starthead 27, startsector 3905536, 6217728 sectors; partition 3: ID=0x83, starthead 36, startsector 10123264, 164825088 sectors; partition 4: ID=0x7, active, starthead 254, startsector 174948352, 450193408 sectors, code offset 0xc0, OEM-ID "      м", Bytes/sector 190, sectors/cluster 124, reserved sectors 191, FATs 6, root entries 185, sectors 64514 (volumes <=32 MB) , Media descriptor 0xf3, sectors/FAT 20644, heads 6, hidden sectors 309755, sectors 2147991229 (volumes > 32 MB) , physical drive 0x7e, dos < 4.0 BootSector (0x0)


ubuntu@ubuntu:/dev$ sudo file -s /dev/sda1
/dev/sda1: x86 boot sector, code offset 0x63, OEM-ID "MSWIN4.1", sectors/cluster 8, Media descriptor 0xf8, heads 255, hidden sectors 2048, sectors 3903488 (volumes > 32 MB) , FAT (32 bit), sectors/FAT 3809, reserved3 0x800000, serial number 0xb4a76668, unlabeled
ubuntu@ubuntu:/dev$ sudo file -s /dev/sda2
/dev/sda2: Linux/i386 swap file (new style), version 1 (4K pages), size 777215 pages, no label, UUID=79834c44-365b-4bca-abdb-ad7b3c2b3a88
ubuntu@ubuntu:/dev$ sudo file -s /dev/sda3
/dev/sda3: x86 boot sector, code offset 0x63
ubuntu@ubuntu:/dev$ sudo file -s /dev/sda4
/dev/sda4: x86 boot sector, code offset 0x52, OEM-ID "NTFS    ", sectors/cluster 8, reserved sectors 0, Media descriptor 0xf8, heads 255, hidden sectors 174948352, dos < 4.0 BootSector (0x80)
ubuntu@ubuntu:/dev$ sudo file -s /dev/sdb
/dev/sdb: x86 boot sector, code offset 0x58, OEM-ID "SYSLINUX", sectors/cluster 8, reserved sectors 1122, Media descriptor 0xf8, heads 255, sectors 7829504 (volumes > 32 MB) , FAT (32 bit), sectors/FAT 7631, reserved3 0x800000, serial number 0x7064a683, unlabeled