# fdisk /dev/sdd
You will not be able to write the partition table.
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x305e46e3.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): o
Building a new DOS disklabel with disk identifier 0x68797fee.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1023, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1023, default 1023):
Using default value 1023

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): c
Changed system type of partition 1 to c (W95 FAT32 (LBA))

Command (m for help): c
DOS Compatibility flag is not set

Command (m for help): p

Disk /dev/sdd: 8120 MB, 8120172544 bytes
250 heads, 62 sectors/track, 1023 cylinders
Units = cylinders of 15500 * 512 = 7936000 bytes
Disk identifier: 0x68797fee

Device Boot Start End Blocks Id System
/dev/sdd1 1 1023 7928219 c W95 FAT32 (LBA)

Command (m for help): c
DOS Compatibility flag is set

Command (m for help): p

Disk /dev/sdd: 8120 MB, 8120172544 bytes
250 heads, 62 sectors/track, 1023 cylinders
Units = cylinders of 15500 * 512 = 7936000 bytes
Disk identifier: 0x68797fee

Device Boot Start End Blocks Id System
/dev/sdd1 1 1023 7928219 c W95 FAT32 (LBA)

Command (m for help): w

Unable to write /dev/sdd