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The HDD Switch is a utility block added by GregTech 6. It houses a single USB HDD, providing access to its files. A Manual or Redstone Selector Cover must be used to specify which of the sixteen files is accessed, and it is only useful when a USB Cable is in the adjacent machine. Files are written to the HDD by right-clicking on the switch with a USB Stick containing the data; this data overwrites what was previously in the selected slot.