Looks like a 5400rpm 1TB WD caviar green.
But it's a standard size for desktops. Laptop hard drives are the same size as a SATA SSD. And the m.2 drives are the size of a large gumstick.
But, the WD greens weren't great drives, so nothing of value was lost - I have 6 of them in my house, and about 4 of them are dead or dying.
My dad bought them for a Intel RST RAID array when he built his hackintosh, all the way when the Intel Core i7-860 was new, and snow leopard was the current Mac OS. The array died a tragic, and very preventable death. (He never bothered to replace the first drive that died, and the second drive death completely killed it)