mounting enclosure, or adapter to connect the HDD to your PC. For a barebones setup involving 2.5-inch drives, you can grab a SATA to USB (preferably USB 3.0) converter and call it a day.

Seagate has debuted a new NVMe hard disk proof of concept Prototype system pairs NVMe HDDs, SSDs, DPUs, and AIStore for AI ...

Use your 2.5" / 3.5" SATA I / II / III as an additional external hard drive.This USB3.0 to SATA adapter supports up to 18TB hard drive. High speed USB 3.0 specification and backward compatible ...

The enclosure that he’s using is meant for a 5.25″ optical drive. It comes with a USB to SATA converter which is how he connects the hard drive to the Raspberry Pi serving the files.