Western Digital Corporation (abbreviated WDC, commonly known as simply Western Digital and WD) is an American computer hard disk drive manufacturer and data storage company. It designs, manufactures and sells data technology products, including storage devices, data center systems and cloud storage services.

Western Digital has a long history in the electronics industry as an integrated circuit maker and a storage products company.

It is also one of the largest computer hard disk drive manufacturers, along with its primary competitor Seagate Technology.

Western Digital Corporation is the world’s largest hard disk drive manufacturer of desktop (3.5” format) and laptop (2.5”) disk drives. WD merged with Hitachi  in 2012, resulting in a combined distribution unit volume of over billion a year. WDC products are supplied to systems manufacturers and resellers worldwide. 

According to en.wikipedia