Fdisk simulation

Updated: 06/02/2020 by Computer Hope

Using the options in this screen lets you create the different partitions. These options only let you create FAT16, and FAT32 partitions if supported and you pressed Y to enable large disk partitions. If you are attempting to create NTFS partitions, use Windows NT Disk Manager.

Create DOS Partition or Logical DOS Drive

Current fixed disk drive:  1

Choose one of the following:

 1.   Create Primary DOS Partition
 2.   Create Extended DOS Partition
 3.   Create Logical DOS Drive(s) in the Extended DOS Partition

Enter choice:  [ 1 ]

1. Create Primary DOS Partition

Choosing this option prompts for the maximum space to be used. If you choose yes, this uses up to 2 GB if creating FAT16 partitions, or up to 32 GB if using FAT32. If you choose no, specify how large you want the partition to be.


You must create primary partitions before being able to create Extended or Logical DOS partitions.

2. Create Extended DOS Partition

With FAT16 and a 2 GB or larger drive or when a drive has as the Primary partition, use this option. The extended DOS partition holds the Logical DOS drives; therefore, use the maximum space left on the hard drive.

3. Create Logical DOS Drive(s) in the Extended DOS Partition

This option is used after you have created an extended DOS partitions. Once the extended DOS partition is created, you then can specify the sizes of other partitions you want to create.

Example of what's explained above

Bob has a six GB hard drive and wishes to divide the hard drive into three partitions, each using FAT 16.

  1. If prompted to use large disk support, press N for no because Bob does not want FAT32, he would like FAT16.
  2. Choose option one to create a Primary partition. Once prompted to use maximum space, press N for no and specify 2 GB as the size of the primary partitions.
  3. Once the primary DOS partition is created, choose option two to create an extended DOS partition. Use the maximum space, which would be four GB because two GB has already been used for the primary partition.
  4. Create two logical DOS drives, each being 2 GB.
  5. Reboot the computer and format each of the drives to allow them to be accessible.

Assuming Bob only had one hard drive, doing the above Bob would have:

Drive C:   Partition 1 (Primary) FAT 16
Drive D:   Partition 2 (Extended/Logical) FAT16
Drive E:   Partition 3 (Extended/Logical) FAT16


Once a primary partition is created, verify the partition is set as an active partition.