Casio IT-2000D - Manual (Page 17)

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2.1.3 Drive Configuration
The drive configuration differs for each model as described in the following:

If F-ROM drive is supported
RAM disk Drive A:
[Read and Write] This drive is prepared 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 starts up MS-DOS. The main body of MS-DOS and
maintenance programs such as the System Menu, etc., are stored in this
drive.
F-ROM drive
Drive D:
[Read and Write] Application programs are stored on this drive. The drive size (storage
capacity) differs depending on the model.
Drive for Windows files (IT-2000W only)
Drive E:
[Read Only] A ROM that stores Windows files is assigned to the drive E: on
Windows models.
This is a reserved drive on DOS models. In this case note that if this
drive is accessed , an INT24h error will occur.
Drive for booting a card
Drive F:
[Read Only] This read-only drive functions only while a card is being booted.
For information about the mechanism of booting a card refer to
Chapter 4.3 “Card Boot”.
PC card drive
Drive G:
[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.
Note:
The drive letter of each drive is reserved. Therefore, these drive letters are not changed even if the
RAM disk is not used.
The drive configuration described in "If F-ROM drive is not supported" on page 18 will be used
only if the drive D: is unformatted or is not recognized by the system for some reason.
However, this will rarely occur because the drive D: has been formatted at the factory.