I use an HP Microserver as a NAS. It's got 5x4TB drives in RAID-Z (ZFS's implementation of RAID-5). The OS I use is FreeNAS:
FreeNAS Project - Open Source Storage - FreeNAS Project
You can install that on (and indeed it's designed to be run from) a USB stick - I use a 16GB HP one. The Microserver has an internal USB header so there's nothing left dangling around.
Also of note, if you're hoping to store VM images on your NAS, I'd stick with wired over wireless for reliability and more importantly performance.
FreeNAS Project - Open Source Storage - FreeNAS Project
You can install that on (and indeed it's designed to be run from) a USB stick - I use a 16GB HP one. The Microserver has an internal USB header so there's nothing left dangling around.
Also of note, if you're hoping to store VM images on your NAS, I'd stick with wired over wireless for reliability and more importantly performance.
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