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RE: HDD replaced with SSD on Xps 15 L521x with 32 gb ssd module, how to configure RST in bios

Change your SATA operation to AHCI and remove the mSATA SSD it is obsolete. See here for more details: 

Dr Philip Yip
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide

Windows FAQs and OEM Downloads

#IDoNotWorkFor Dell
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