Routing Engines And Storage Media Names (J Series Routers); Boot Sequence (J Series Routers); Table 4: Routing Engines And Storage Media Names (J Series Routers) - Juniper JUNOS SOFTWARE 10.2 - SOFTWARE INSTALLATION AND UPGRADE GUIDE 4-28-2010 Upgrade Manual

Storage Media
The J Series routers use the following media storage devices:

Routing Engines and Storage Media Names (J Series Routers)

Table 4 on page 21 specifies the storage media names used by the J Series routers.
The storage media device names are displayed as the router boots.

Table 4: Routing Engines and Storage Media Names (J Series Routers)

To view the storage media currently available on your system, use the CLI
system storage
CLI User's Guide.

Boot Sequence (J Series Routers)

The router attempts to boot from the storage media in the following order:
1.
2.
3.
Internal CompactFlash card—The CompactFlash card is the primary boot device.
External media device—Depending on the system, this external device can be
a CompactFlash card or a USB storage device. Juniper Networks recommends
that you attach an external device to the system and use this external device as
the backup boot device for the system.
Internal
CompactFlash
Routing Engine Card
J Series Routers ad0
command. For more information about this command, see the JUNOS
Internal CompactFlash card
External CompactFlash card (J4300 and J6300 routers only)
USB storage media device
Routing Engines and Storage Media Names (J Series Routers)
Chapter 2: Hardware Architecture
External CompactFlash Card
J4300 and J6300 Routers
Only
ad2
USB Storage Media
Devices
da0
show
21