The tr 004 usb 3.0 raid expansion enclosure allows you to expand the capacity of your qnap nas and pc'. '.strtoupper('t')he tr 004 can also be utilized as a das direct attached storage device, allowing you to directly access its content just by connecting it via usb'. '.strtoupper('t')he tr 004 features four 3.5 inch sata drive bays with multiple raid configuration options and usb 3.0 type c connectivity to bring you a highly reliable and secure storage capacity expansion solution'. '.strtoupper('u')sb 3.0 type c port for faster data transfer'. '.strtoupper('s')upports up to four sata drives for reliable read and write performance disk mode dip switch to change from hardware control and software control configurations for setting raid group'. '.strtoupper('l')ockable hard drive trays to prevent accidental drive removal'. '.strtoupper('e')ject button for disconnecting the tr 004 from a nas or computer'. '.strtoupper('i')nstantly back up files from the tr 004 to the nas using the one touch copy button.