Q: What would you like to provide the feedback on? A: Product Compatibility - Will this work with a western digital wd6400aks

Yes, this adapter supports 2.5"/3.5" SATA HDDs, which includes the Western Digital WD6400AKS as it's a 3.5" SATA hard drive.

Questions & Answers: USB 3.0 to IDE and SATA Converter External Hard Drive Adapter Kit for Universal 2.5/3.5 HDD/SSD Hard Drive Disk, One Touch Backup Function, Included 12V/2A Power Adapter

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USB 3.0 to IDE and SATA Converter External Hard Drive Adapter Kit for Universal 2.5/3.5 HDD/SSD Hard Drive Disk, One Touch Backup Function, Included 12V/2A Power Adapter

Universal Hard Drive Adapter -- This device supports 2.5"/3.5" IDE/SATA/SSD hard drive disks and 5.25" CD/DVD drives, getting all your drives active through USB port to the computer. (For 3.5 IDE drivers and old SATA HDD, you need to connect 12V 2A power adapter and 4-pin power cable provided. Attention please turn on the SWITCH on IDE adapter in the last step.)
Specification
Supported Drives: 2.5"/3.5" SATA HDD/SSD; 2.5"/3.5" IDE HDD; DVD-ROM, CD-ROM, CD-RW, DVD-RW, DVD+RW;
Compatible Systems: Windows8/7/10/Vista/XP/Mac OS 9/10/Linux;
Supports drives with a capacity of up to 6 TB;
Support speed up to 5Gbps;
Support USB3.0, Backward compatible with USB 2.0/1.1;
On/Off Switch for HDD protection;
DC Power Supply 12V included for 3.5" devices ;
LED activity indicator, Plug & Play, simple, reliable and stable
Compatible Hard Drives:
2.5 3.5 SATA HDD/ SDD
2.5 3.5 IDE HDD
DVD-ROM
CD-ROM
CD-RW
DVD-RW
DVD+RW

$28^.99 –