Purchased 2 of these units was very pleased nice small quiet units for family use. Then one PC the HD started making noise & vibrate then failed. Ordered a new SSD to replace but was not able to install because BIOS was locked and so not able to replace and set up new drive with Windows 10 system. The other unit I purchased at same time still works and able to access BIOS ok. So dissatisfied that one unit failed and not able to access LOCKED BIOS to replace failed HDD