The HP 640 MT has an HDD storage medium which is faster than the SSD storage medium found on most computers that were released in the last year. A Hard Disk Drive (HDD) is the traditional storage method for computers. A HDD stores the information on magnetic disks. HDD drives are cheap, but they are slower than Flash and SSD bases storage systems.
If you are looking for a PC with a faster storage speed then you might want to consider the HP Z440[plb_3194679_price] (SSD).