I have multiple partitions and my last partition regularly disappears

There are two workarounds for this phenomenon:

  1. Only use one primary DOS partition.
  2. Using FDISK, follow the steps below when partitioning the drive:
    1. Create a primary DOS partition with the desired size.
    2. Reboot
    3. Create an extended DOS partition using 99% of the available space remaining instead of 100%
    4. Reboot
    5. Create as many logical DOS drives as required, but with a reboot between each logical drive created.