These servers are great if you only need 4 drives, but what if you want to LVM or RAID 4 of the drives and then have a 5th drive for the OS? There is no power available for a 5th drive, nor any space. Luckily there are 2 internal USB ports. You can use a thumbdrive but if you want better longevity or don’t want to have to tweak your OS for fewer writes, a 2.5″ hard drive will fit nicely, assuming you don’t have a DVD drive.
First, take a 2.5″ hard drive enclosure and remove the motherboard from the enclosure.
Then mount the drive where the DVD would be and run the cables to the USB port.
Now you can install your OS from a thumb drive or USB-CDROM. After that you can set the default boot device to “Internal USB: <drive serial number>”
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