Buffalo OP-HD2.0T/512-3Y 2000GB Serial ATA II internal hard drive

2TB Replacement Hard Drive TS-VHL, WS-VL, TS-IS Series If the capacity is not available, a larger capacity drive can be used to replace a TeraStation hard drive. For example, if replacing a 500 GB hard drive in a TeraStation, customers can use a 1 TB model. Hard drive capacities and availability change from time to time, so in some cases a larger hard drive must be used as a replacement. If a larger hard drive is used in a RAID configuration, it will appear as the same size as the other hard drives in the array.