CompTIA A+ 220-902

Answer: C - The operating system determines the letter assigned to a given drive.

Key Takeaway:
Most operating systems use the following logic to assign drive letters:

1. Assign the drive letter A to the first floppy disk drive and B to the second floppy disk drive.
2. Assign the drive letter C to the first active primary partition recognized on the first physical hard disk.
3. Assign subsequent drive letters to the first primary partition upon each successive physical hard disk drive.
4. Assign subsequent drive letters to every recognized logical partition, beginning with the first hard drive and proceeding through successive physical hard disk drives.
5. Assign subsequent drive letters to any RAM disk.
6. Assign subsequent drive letters to any additional floppy or optical disc drives.