Amazon.com: 2nd HDD SSD Hard Drive Optical Bay Frame Caddy Adapter for Lenovo ThinkPad E540 E531 with Bezel Front Cover Mounting Bracket : Electronics
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Amazon.com: Hard Drive Caddy Universal 9.5mm SATA to SATA HDD Caddy Adapter Tray Enclosures SSD Mount for Lenovo ThinkPad E440 E540 E431 E531 L540 L440 : Electronics
Amazon.com: Nimitz 2nd HDD SSD Hard Drive Caddy Compatible with Lenovo Thinkpad E540 E531 with Faceplate/Bracket : Electronics
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New 2° ssd hhd hard disk tray holder, for Lenovo ThinkPad :E540 T400P E550 T400 Y430P S410P T410 L440 T400 S420 U400 U450 U450A - AliExpress
Replacements-Upgrades-and-Issues-for-E540 - English Community - LENOVO COMMUNITY