USB Port Specifications for an EX Series Switch
The following Juniper Networks USB flash drives have been tested and are officially supported for the USB port on all EX Series switches:
Any USB memory product not listed as supported for EX Series switches has not been tested by Juniper Networks. The use of any unsupported USB memory product could expose your EX Series switch to unpredictable behavior. Juniper Networks Technical Assistance Center (JTAC) can provide only limited support for issues related to unsupported hardware. We strongly recommend that you use only supported USB flash drives.
All USB flash drives used on EX Series switches must have the following features:
USB 2.0 or later.
Formatted with a FAT or MS-DOS file system.
If the switch is running Junos OS Release 9.5 or earlier, the formatting method must use a primary boot record. Microsoft Windows formatting, by default, does not use a primary boot record. See the documentation for your USB flash drive for information about how your USB flash drive is formatted.