I am replacing a ST9750423AS, which is no longer made. Will the ST9750420AS be a compatable replacement?

I bought a Seagate Momentus ST9750420AS to replace the old disk on Lenovo X61. This one is compatible with ST9750423AS, but its write/read speed is faster than that of ST9750423AS. The RPM of ST9750420AS is 7200, while ST9750423AS is 5400 RPM.

Do you have a SSD with similar specs and form factor to this HD?

Newegg offers 2 different SSHD's from Seagate with somewhat similar specs to this drive (these are hybrid drives, not true SSDs), one being 500GB and one 1TB. ST500LM000 and ST1000LM014. Depending on which specs you're trying to match (because an SSD is simply NOT going to match a regular hard drive for performance specs), one of these might be a good option. If you want a true SSD, ST480HM000 is the closest in size (480GB) currently sold on Newegg from Seagate. It's a 7MM height rather than the 9.5mm of the drive you linked, but will obviously fit. If your target is 750GB in a true SSD that will fit in the same slot as the drive listed, the Samsung MZ-7TE750BW will likely be your best match. In case you're interested, the largest capacity SSD's currently sold on Newegg are 1TB.

Would this be compatible with an HP dv4-1555dx laptop?

Should be. Esata connector. 99%of computers use it

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Seagate Momentus ST9750420AS 750GB 7200 RPM 16MB Cache SATA 3.0Gb/s 2.5" Internal Notebook Hard Drive Bare Drive

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G-Force Protection technology can protect your data even if you drop your laptop
SATA 3Gb/s, 7200 RPM, 16 MB Cache
Height: 9.5mm

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USED Seagate Momentus ST9750420AS 750 GB 2.5" SATA II Laptop Hard Drive Erased (DoD 5220.22 M Compliant) and tested good (Not formatted, partitioned, or allocated). Sold as used and in working condition. There may be drives that have up to 25 bad sectors. There may be writing or markings on the drive or the drive may vary slightly (color and/or label may differ) from picture but the model numbers will be the same.

SmartAlign technologySeagate SmartAlign technology provides a transition to 4K sectors without the need for software utilities.
Self-Encrypting DrivesSeagate Self-Encrypting Drives deliver government-grade encryption without performance degradation—protecting your data where it lives.
G-Force ProtectionSeagate G-Force Protection technology can detect when your laptop is in a free-fall, swing the drive heads to a safe zone and keep the data safe.

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Model
Brand	Seagate
Series	Momentus
Model	ST9750420AS

Performance
Capacity	750GB
RPM	7200 RPM

Dimensions
Form Factor	2.5"

Performance
Interface	SATA 3.0Gb/s

Model
Packaging	Bare Drive

Performance
Cache	16MB
Flash Memory Capacity	N/A

Features
Features	Important Warranty Information This product is end-of-sale and no longer warranted by the manufacturer. Instead, Newegg warranties this product for one year from date of purchase. If you require warranty service after thirty days, please contact Newegg Customer Service, not the manufacturer.
Usage	Ideal for Servers

Dimensions
Height (maximum)	9.5mm
Width (maximum)	69.85mm
Length (maximum)	100.35mm

Additional Information
First Listed on Newegg	May 30, 2016

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