How to install SSD as an external usb device without uninstalling HDD

You will need something like shown here: https://www.amazon.com/External-Solid-State-Drives/b?ie=UTF8&node=3015429011

Please consider that those devices will have to be connected to your PC using USB, Thunderbolt, whatever. Depending on your motherboard, you´ll not receive native SATA3 speed. And please, don´t install your Windows on an external device. Which leads to the next point: if your Windows is running from an HDD, you´ll not benefit very much from an SSD. Starting Windows will still be a pain in the back compared to the speed when the OS boots from SSD.
 


ok will install an internal ssd without uninstalling my hdd. Bassically i will do it because my ram and cpu are quite fast but when i check task manager usually is at full usage. I run websites at localhost and it eats my hard drive. I hope ssd will be faster
 
It is possible to use it as external USB device, although it's not sure that it will boot on every computer.
Will it have the same performance as an external device - No, after all USB has different speeds compared to sata.