If you're looking to increase the storage capacity of your Firestick, whatever version you have. These are flash drives to use. They're very fast, and the Firestick will recognize them when they're connected. There is a lot of information on how to increase Firestick storage if you don't know how. Now I can download as many apps and games as I want and still have enough room for Firestick OS to stretch my legs.
Kingston DataTraveler flash drive 100 G3 256 GB, 1 pc. black
74 Review
Samsung BAR Plus 128GB USB 3.1 Flash Drive - 400MB/s - Champagne Silver (MUF-128BE3/AM)
65 Review
Compact and Convenient: SanDisk Cruzer Fit USB 32GB Flash Drive (SDCZ33-032G-A11)
66 Review
Kingston DataTraveler SE9 32GB USB 2.0 Flash Drive for Reliable Data Storage (DTSE9H/32GBZ)
69 Review
2 TB External HDD ADATA DashDrive Durable HD650, USB 3.2 Gen 1, Blue
55 Review
Game console Microsoft Xbox One X 1000 GB HDD, black
53 Review
18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
95 Review
8TB Seagate Backup Plus Hub Desktop Hard Drive with Data Recovery Services
56 Review