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I get the same result, with an added wrinkle.

250Gb external hard drive connected (USB2) to PIV server
running Mdk10.1 (kernel 2.6.8)

Drive shfsmounted on Athlon 1GHz client (Mdk10.1, 2.6.8),
df reports all sizes 4x too big

Drive shfsmounted on Pentium M 2GHz client (Mdk10.1, 2.6.8),
df reports all sizes 4x too big
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Start again:
umount drive on PIV; shfsmount drive on PIV.
df reports stupid numbers (size 4M, for 250G hdd!)

Athlon & P-M machines: df reports sizes 4x bigger than stupid
numbers.
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df Use% correctly reported in all cases