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The command line procedure is not simple, but it is the most likely thing to work.

When re-formatting the "drive" you're actually only formatting a partition on the drive. You need to use the diskpart utility to remove the partitions and create 1 single partition covering the full volume.

diskpart can be a bit dangerous, because if you pick the wrong disk or partition, you can remove data or partitions that are extremely, EXTREMELY important and lose all data on your machine.

Proceed with extreme caution!

Open up a command prompt as administrator (open the start menu, type cmd and press Enter.)

Type diskpart and press Enter. You'll end up with a new prompt that looks like this:

DISKPART>

Type

list disk <ENTER>

and you'll get a listing of all drives on your machine.

Type

select disk # <ENTER>

to select a disk, where # is the number of the disk Windows screw-balled. Usually, the device is disk 1, but it's always best to make sure.

Then type

list partition <ENTER>

to get a listing of all partitions on the disk.

If you're sure you have the right disk/partition, you can then repeat typing

select partition # <ENTER>
delete partition <ENTER>

until all partitions are removed from that drive (you may need to type delete partition override for protected partitions).

Once the drive is empty, exit diskpart and remove the drive. Wait at least 5 minutes, then re-insert the drive. DO NOT CLICK FORMAT – this will most likely re-create the problem. Instead, enter diskpart again, and select the disk. Then type

create partition primary <ENTER>

Once you have created the partition, exit diskpart and, in the command promt, type

diskmgmt.msc <ENTER>

This will provide a reliable way to create a FAT32 partition. On the drive you would like to format (NEVER TOUCH DISK 0!), right click and select format. The allocation unit size option should be default, and the File System option should be set to FAT32. The format may take a while, depending on the disk size, be patient.

This should fix partition troubles on any readable USB flash drive.

When re-formatting the "drive" you're actually only formatting a partition on the drive. You need to use the diskpart utility to remove the partitions and create 1 single partition covering the full volume.

diskpart can be a bit dangerous, because if you pick the wrong disk or partition, you can remove partitions/disks/etc. that you didn't want to remove, and lose all data on your machine. Proceed with extreme caution!

1. Open up a command prompt as administrator (open the Start menu, search for "Command Prompt", right-click and select "Run As Administrator". You'll get a black text-only window that pops up.

2. Type diskpart and press Enter. You'll end up with a new prompt that looks like this:

   DISKPART>
   

3. Type list disk, and you'll get a listing of all drives on your machine.

4. Type select disk # to select a disk, where # is the number of the disk you want to edit.

5. Then type list partition to get a listing of all partitions on the disk.

6. If you're sure you have the right disk/partition, you can then type select partition # and delete partition until all partitions are removed from that drive.

7. Once they're all removed, type create partition primary to create a new partition that covers the entire drive. Alternatively, at this point you can create multiple primary partitions of varying sizes as needed by appending SIZE=# (in MB) to the end of the create partition statement. Not specifying a size will use the entire disk.

8. Once the partition is created, type exit twice (to exit diskpart, and then to close the command prompt) and then use the format option to format that blank partition.

Use this empty bootsector program if you want to reformat your device when you have written multiple partitions on you flash drive and Windows doesn’t recognize the full device size anymore. Just restore it in device mode