I have a hp 17.3 laptop will this ssd fit it? 2.5" 2tb SAT3 3D NAND internal ssd

The quick answer is yes it should. Long answer is as long as you have a 2.5" sata drive bay in the laptop and you may have to update the laptop bios for it to pick up the full 4TB. I had a HP x360 Envy and it supported this 4TB SSD from Western Digital.

Questions & Answers: Western Digital Blue 2.5" 4TB SATA III 3D NAND SSD

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Western Digital Blue 2.5" 4TB SATA III 3D NAND Internal Solid State Drive (SSD) WDS400T2B0A

Award Winning WD Blue 3D NAND SATA SSD.
Capacities up to 4TB with enhanced reliability.
An active power draw up to 25% lower than previous generations of WD Blue SSD.
Sequential read speeds up to 560 MB/s and sequential write speeds up to 530 MB/s.
An industry-leading 1.75M hours mean time to failure (MTTF) and up to 600 terabytes written (TBW) for enhanced reliability.
WD F.I.T. Lab certification for compatibility with a wide range of computers.
Free downloadable software to monitor the status of your drive and clone a drive, or backup your data.

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