Do you always have to have the power adapter plugged in? In other words can it work without the power adapter, in the case of an SSD drive?

It does not need to have the power adapter connected when either using 2.5" SATA hard drive or any SSD. The power adapter is only for the 3.5" SATA hard drive.

Questions & Answers: StarTech USB31C2SAT3 USB C to SATA Adapter Cable - for 2.5 / 3.5” SATA Drives - 10Gbps - USB 3.1 - SATA to USB Adapter - External Hard Drive Cable

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StarTech USB31C2SAT3 USB C to SATA Adapter Cable - for 2.5 / 3.5” SATA Drives - 10Gbps - USB 3.1 - SATA to USB Adapter - External Hard Drive Cable

Connect a 2.5"/3.5" SATA SSD/HDD to your USB-C enabled computer with this USB 3.1 adapter cable
Transfer and backup data from a SATA drive to your USB Type C laptop or PC with the fast speed of USB 3.1 (10Gbps)
Thunderbolt 3 port compatible
Supports SATA I/ II/ III
Includes power adapter
Tool-free cable-style adapter for quick access to external data
SATA drive adapter with integrated 1m cable
UASP support
USB C to SATA Adapter Cable / SATA USB adapter / SATA to USB adapter

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