What size is this drive?

640 GB which is about 2/3 the size of a 1TB hard drive. Sorry to say but when I bought one of these I found it was like 3 years old already. Unused, but it is an OEM product that has a short term or no Western Digital warranty. This seller shows as covering it themselves, but I want WD to warranty any problems. The listing is not clear and links to WD. I complained and got a refund. I am not happy that WD has not fixed this listing with the seller. If it lasts it is a good deal but be aware you are at the mercy of this seller for warranty problems.

does this work on a 2008 mac pro 3,1 desktop ?

I think this will. But, I am not positive. IF the sys board has the connectors, it should.

$21^.24

$32.98

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Main image of Western Digital Blue WD6400AAKS 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive

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Western Digital Blue WD6400AAKS 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive

Used - Very Good

7200 RPM
16MB Cache
SATA 3.0Gb/s
3 years limited

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

Overview

Specs

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USED Western Digital WD Caviar Blue WD6400AAKS 640GB SATA II (3.0Gb/s) Desktop Drive

Western Digital
WD6400AAKS
640GB

SATA 3.0 Gb/s InterfaceThe next-generation SATA interface supports up to 3.0 Gb/s data transfer rates, Native Command Queuing (NCQ) and hot-pluggable point-to-point connections to allow the Western Digital Caviar Blue WD6400AAKS to deliver optimum performance, efficiency, convenience and flexibility.
WD WhisperDrive and SoftSeek TechnologyWhisperDrive technology minimizes noise to virtually below the threshold of human hearing. To cut seek noise, SoftSeek technology streamlines read/write seeking algorithms resulting in more efficient operation.
WD Data Lifeguard TechnologyExclusive Data Lifeguard data protection features include shock protection, an environmental protection system and real-time embedded error detection and repair. WD's Data Lifeguard technology automatically finds isolates and repairs problems that may develop over the life of a hard drive.
WD ShockGuard TechnologyShockGuard technology instantaneously protects the hard drive against damage from bumps and vibrations during operation. This technology enables WD Caviar drives to achieve industry-leading shock specifications.

Model
Brand	Western Digital
Series	Blue
Model	WD6400AAKS

Performance
Interface	SATA 3.0Gb/s
Cache	16MB
RPM	7200 RPM

Dimensions
Form Factor	3.5"

Additional Information
First Listed on Newegg	July 17, 2020

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Item#: 9SIAEEN6WW4771