What are the similarities of A and C drive?

Answer 1

The similarities depend on the platform. But generally the only similarity is they are drives in a drive letter access system. On Wintel machines that had them back in the day, A was the designation for floppy drives and C was the designation for the first hard disk.

Keep in mind that how a drive is actually exposed to the user is entirely up to the operating system. While Windows will have an A: C: D: drive, etc. Linux allows access to them by mounting their device files right on the directory tree and there ARE no drive letters. For example, a floppy drive is likely going to be /dev/fd0. One can insert the disk, then as root:

mount -t vfat /dev/fd0 /media/floppy

(Assuming there is a directory /media/floppy.). Then you can just change to that directory using a shell or file manager and access it as if it were just any other subdirectory on your filesystem.

Today floppy drives are nearly extinct. The high dendity floppies we had just a decade ago just plain don't have the capacity to be useful, and with DVD-RW and flash media being the standard removable media there's no motivation to create a "new floppy."