Casio IT-2000D - Manual (Page 18)

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If F-ROM drive is not supported
RAM disk Drive A:
[Read and Write] This drive is readied for use after the RAM disk size is specified from
the System Menu. The contents of this RAM disk will not be erased
through a boot process or by pressing the RESET switch.
Basic drive (DINOR FLASH ROM)
Drive C:
[Read Only] This drive is used to start MS-DOS. In this drive not only the main body
of MS-DOS but also the maintenance programs such as the System
Menu, etc., are stored. This is a read-only drive.
Reserved drive
Drive D:
[---] This is a reserved drive.
If this drive is accessed, an INT21h error will result.
Drive for booting a card
Drive E:
[Read Only] This is a read-only drive that functions only while a card is booted.
For information about the mechanism of booting a card refer to
Chapter 4.3 "Card Boot”.
PC card drive
Drive F:
[Read and Write] This drive is required if the application program accesses the PC card.
This drive is prepared for use by loading the PC card driver via
CONFIG.SYS.