The 4x HGST Ultrastar 7K4000 HUS724040ALE640 4TB 3.5" Desktop Hard Drive SATA is a high-quality internal desktop drive that offers reliable storage capacity of 4TB. With a rotation speed of 7200 RPM and a cache of 64MB, this silver-coloured hard drive by HGST is compatible with PCs and is suitable for various applications such as SATA servers, NAS devices, RAID systems, and surveillance systems. Its compact form factor of 3.5 inches makes it ideal for desktop use, and its interface is Serial ATA-600, ensuring efficient data transfer. Selling as a pack of 4 SSDs. Opened and used - but by the previous downer. I never got to use the drives myself.
eBay