Hmm, looks like a large difference, but
61,477,126,144 bytes = 57.2Gb, that is correct calculated (divided by 1024).
Maybe the HD vendor exceeded the capacity a bit by saying it is 60 GB ?

Anyway, if you use fdisk it will show you all partitions and their corresponding size.

Doesn't look like there's anything hidden to me.

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Enlight 340W, EPOX 8KHA+ VIA KT266A, Athlon 1.53G XP w/Volcano 6Cu+, DDRAM 256MB, 20GB + 8GB HD, ATI Radeon 7200 64MB, SB PCI 512, Sony CD 52X, Lite On 24/10/40, 3 Fans, ZIP etc...on W98