NEC Express5800 Series User Manual page 56

2-26 General Description
If the optional floppy disk drive is connected, the drive letter may change from
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A to B when switching betweem CPU/IO modules.
The drive letter for the DVD-ROM drive is allocated automatically. The next available letter
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is allocated to the drive in the order from D to Z. A drive letter to the DVD-ROM can be
manually specify the drive letter.