Install an mSATA SSD for the OS and keep the HDD as storage - iFixit Repair Guide
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LEVEN mSATA SSD 1TB 3D NAND TLC SATA III 6 Gb/s, mSATA (30x50.9mm) Internal Solid State Drive - Compatible with Desktop PC Laptop - (JMS600-1TB) : Amazon.in: Computers & Accessories
An Overview of mSATA and M.2 SSDs | Crucial IN
What is an mSATA SSD (mSATA Solid-State Drive)?
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mSATA VS M.2: What's the Difference Between mSATA and M.2 SSD