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What to Do With Your PC's Unused Optical Drive Bays
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EDGE Drive Bay Adapter for 3.5 | Accessories PE254230 | PCNation.com
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MB834M2K-B_2 Bay M.2 PCIe 3.0/4.0 NVMe SSD Mobile Rack for External 3.5" Drive Bay
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Bay Devices | PC Case Gear
5.25 inch Tray-Less Hot-Swap Mobile Rack for SATA 3.5" Hard Drive HDD Caddy Dock | eBay
EDGE Drive Bay Adapter for 3.5 | Accessories PE255954 | PCNation.com
Amazon.com: Kingwin SSD/SATA to IDE Bridge Board Adapter, Convert All SATA Devices Easily to IDE. Support 2.5 Inch, 3.5 Inch HDD, & Compatible w/ SATA I/II/III Hard Drives : Electronics
3.5 inch 5.25 Bay Stainless Internal Hard Drive Mounting Bracket Adapter
Discussion] 35+ gadgets to put in your 5,25" bays (no toasters) : r/buildapc
USB2.0 Front Panel Hub, USB Floppy Front Panel 3.5 Inch Floppy Bay 9 Pin to 4 Interface USB 2.0 HUB, Computer Accessories
Two 5.25" Half Height slots for your 19 inch rack
QDA-A2AR | Use two 2.5-inch SATA drives in a single 3.5-inch SATA drive bay with RAID support for PC and NAS | QNAP (US)