From what I can see, floppy drives are not supported on the 280R
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Removable Media
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Manufacturing Description
Option # Part #
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X6167A [S] 370-3415 [F] SunCD 32
X6168A [S] 390-0025 [F] 10X DVD-ROM Drive
X6213A [S] 370-2882 [F] 7-14GB 8 mm Tape Drive (Medium Grey Bezel)
X6286A [S] 370-2376 [F] 12-24GB 4 mm DDS-3 Tape Drive (Medium Grey Bezel)
X6295A [S] 390-0028 [F] 20-40GB 4 mm DDS-4 Tape Drive (Medium Grey Bezel)
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