The USB slots on J-series Services Routers accept a USB storage device or USB storage device adapter with a compact flash disk installed, as defined in the CompactFlash Specification published by the CompactFlash Association. When the USB device is installed and configured, it automatically acts as a secondary boot device if the primary compact flash disk fails on startup. Depending on the size of the USB storage device, you can also configure it to receive any core files generated during a router failure.
Table 1 lists USB devices supported for use with the J-series routers.
Table 1: Supported USB Devices on the J-series Services Routers
Contact Juniper Networks customer support before using USB interfaces in a J-series Services Router.