Most techs have an "appliance" PC or two in their tool box. @Mainstay mentioned appliance PCs with the Voyo. I'm a sucker for good older hardware so we've been using the HP t5730 as our PC appliance of choice for quite a few years now. We used to use it with the Win XPe that came with it but obviously not for some time. Lately we've been thickening the t5730s up quite a bit and running 32-bit Win7 or Pro where needed. (They'll accept a drop in Mobile Sempron 3600+, 2 GB of DDR2 and (reluctantly) any old 2.5" IDE PATA hard drive. The t5730s have six external USB ports plus two that are hidden, DVI and VGA, PS2 ports, gigabit Ethernet, full sound, etc. and draw almost no power (~18 watts). We have used the secure USB ports and leave a bootable USB Flash drive in one and a WiFi stick in the other. Plug it in and set it on a bookshelf or stick it in a drawer. They're silent, built tough and pretty much bullet proof but do run hot with the 3600+ Sempron. They run on 12 volts (mobile applications) and resume on power outage. We use a cheap SSD in place of a HDD in ruggedized applications. (And yes they are single-core 32-bit appliances. Not everything requires 64-bit four cores and 16 GB of RAM.)
I just thickened one up and took a few pictures along the way.
A quick pic of the stock Sempron 2100 in socket with the Mobile Sempron 3600+ (circled - sitting on the heatsink for the Radeon graphics chip) waiting to take its place. We do like the 3600+ for the performance and being a mobile chip will throttle itself down to less than the stock Sempron 2100. I also circled the standard 2.5" PATA IDE header. Standard DDR2 laptop RAM (2 GB max) is also used.
A pic showing an HDD being nestled under the hood. No mounting. Caveman engineering. The fit is tight. Just a 2" IDE cable and squish. Insulate the HDD from grounding or use a plastic SSD. We've used an IDE to micro SD adapters instead of HDDs before but very slow.(Didn't realize at the time a HDD would fit.) I circled the two secure USB ports.
Here's the top cover pulled off a fully assembled unit showing the two secure USB ports. Both are bootable so the 1 GB stock Flash drive in the unit becomes almost irrelevant when you boot and run from a 16/32 GB USB Flash drive.
They are used inexpensive units. They sell for about $30 on Ebay. There's plenty of old DDR2 RAM around to pump them up a bit and the Sempron 3600+ is a couple of bucks if added. And, if something happens to one it's really not an issue for us as there isn't much invested.
Sorry for the ramble. That type of cold rainy morning here....
(Pics resolved...)

I just thickened one up and took a few pictures along the way.
A quick pic of the stock Sempron 2100 in socket with the Mobile Sempron 3600+ (circled - sitting on the heatsink for the Radeon graphics chip) waiting to take its place. We do like the 3600+ for the performance and being a mobile chip will throttle itself down to less than the stock Sempron 2100. I also circled the standard 2.5" PATA IDE header. Standard DDR2 laptop RAM (2 GB max) is also used.

A pic showing an HDD being nestled under the hood. No mounting. Caveman engineering. The fit is tight. Just a 2" IDE cable and squish. Insulate the HDD from grounding or use a plastic SSD. We've used an IDE to micro SD adapters instead of HDDs before but very slow.(Didn't realize at the time a HDD would fit.) I circled the two secure USB ports.

Here's the top cover pulled off a fully assembled unit showing the two secure USB ports. Both are bootable so the 1 GB stock Flash drive in the unit becomes almost irrelevant when you boot and run from a 16/32 GB USB Flash drive.

They are used inexpensive units. They sell for about $30 on Ebay. There's plenty of old DDR2 RAM around to pump them up a bit and the Sempron 3600+ is a couple of bucks if added. And, if something happens to one it's really not an issue for us as there isn't much invested.
Sorry for the ramble. That type of cold rainy morning here....
(Pics resolved...)
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