Well it's not sensible. For the OS, the drive should be as fast as possible. From any hard disk drive, the first ¼ is the fastest part, in the second half of the disk you see a sorrowful decline, it's simply the nature of the device.rditto48801 wrote: [...]
Would it be crazy/overboard to get a smaller HDD later on (maybe just 250GB) just for an OS, system files, drivers and virtual memory?
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So, on a fast 1 TB drive (like the WB Black Edition), creating a first partition of say 200 ~ 250 GB and designating it to Windows 7 x64 and all programs (also including pagefile.sys [automatic virtual memory], hyberfil.sys [sleep mode] and a System Restore set at a generous 10%) makes perfectly sense.
Getting a 250 GB harddiskdrive would make sense if you'd dedicate it totally (100%) to the system's virtual memory. Otherwise, you shouldn't buy it at all, as it's very inefficient and relatively way too expensive. A 1 TB drive is the sweet spot now, and WD's Black Edition scores very high with price/performance ratio.