Amazon's Prime Day is a great time to pick up gear and upgrades you wouldn't normally think about. In case you've never used a solid-state drive (SSD) before, it's a class of add-ons that bolster a device's built-in storage.

If there is any other SSD brand that garners the same reputation as Samsung, it's Western Digital. The WD Black SN7100 and Black SN8100 are the two latest models from Western Digital. The WD Black SN7100 is a direct competitor to the Samsung 990 Evo Plus.