Is it true that the thickness of different hard disks is still the same regardless of its volume?

It should be. ANSI and all of that crap...

I've seen my share of the new huge drives (120gb +) and they are all the same size as the 540mb I had in my 486.

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MSI 875P NEO-LSR Mainboard - Intel P4C 3.0Ghz (800Mhz FSB) - 2 x OCZ PC4000 512MB DIMMs - 4 x WD800JB 80GB/8MB Cache (RAID 0+1) - SB Audigy Platinum eX - ATi Radeon 9800 Pro AIW - Sony Trinitron 19" - Windows Server 2003 Enterprise

Wanna see a big drive?

Here's the sucker I took out of an old 8088/86(not sure) that my dad picked up off the street

I don't think it's even a Meg

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MSI 875P NEO-LSR Mainboard - Intel P4C 3.0Ghz (800Mhz FSB) - 2 x OCZ PC4000 512MB DIMMs - 4 x WD800JB 80GB/8MB Cache (RAID 0+1) - SB Audigy Platinum eX - ATi Radeon 9800 Pro AIW - Sony Trinitron 19" - Windows Server 2003 Enterprise