What does the 64MB cache do? And how do I know if I need it?

Cache is the amount of data the hard drive can keep readily available similar to how RAM works. The more cache you have the more you can keep available when you need it. retrieving data from cache is much quicker then searching the hard drive for the data. More cache speeds up data retrieval. You don't need more cache unless you want faster data retrieval.

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Main image of WD Purple WD50PURX 5TB 5400 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Surveillance Hard Drive Bare Drive

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WD Purple WD50PURX 5TB 5400 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Surveillance Hard Drive Bare Drive

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Engineered specifically for surveillance security systems.
Supports up to 180TB/year workload rate.
Tuned for write-intensive, low bit-rate, high stream-count applications typical to most surveillance applications.
Prioritized write-operations for maximized surveillance performance.
TLER & ATA streaming support.
Support for more than eight bays.
3-year limited warranty.

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

Overview

Specs

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Model
Brand	WD
Series	Purple
Model	WD50PURX
Packaging	Bare Drive

Performance
Interface	SATA 6.0Gb/s
Capacity	5TB
RPM	5400 RPM
Cache	64MB

Features
Features	WD Purple surveillance storage is built for 24/7 always-on surveillance in high-definition security systems that use up to eight hard drives and up to 32 cameras. Exclusive AllFrame technology works with ATA streaming to reduce error pixilation and video interruptions that occur when desktop hard drives are incorrectly used as storage in security systems. Desktop drives vs.surveillance-class storage Surveillance storage for peace-of-mind Improve performance with AllFrame Engineered for compatibility Optimized performance for up to 32 HD cameras Lower power consumption 3-year limited warranty (worldwide)

Dimensions
Form Factor	3.5"
Height (maximum)	26.1mm
Width (maximum)	101.6mm
Length (maximum)	147mm

Additional Information
First Listed on Newegg	June 18, 2021

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Return for refund within: 30 days
Return for replacement within: 60 days
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Item#: 9SIAAEEF273063