There was a 3-year wait after the launch of DDS3 before DDS4 was launched in1999. DDS 4 was released on a 150m with a capacity of 20 GB (a similar rise as from DDS2 to DDS 3). However, there was a significant rise in the transfer speed between DDS3 and DDS 4 with transfer rates going up to 3.2 MB/s (almost 200% increase in transfer rate). We sell DDS4 tapes by Sony, HP and Maxell and a discount offered for purchases of more than 20 units. There are the following types of versions and products available for DDS tapes: DDS-1, DDS-2, DDS-3, DDS-4 or DAT40, DDS-5 or DAT72, DAT160, DDS Cleaning Cartridge and Barcode Labels.