Getting inside the NSS3000 is easy. Just remove six screws on the bottom of the unit and slide the cover off. Figure 3 shows right side view, where you can see the easily-replaceable power supply perched atop the main drive bay assembly. The two fans on the rear panel, particularly the bottom one, are somewhat tougher to get at.
Figure 3: Inside right view
The left side view affords a view of the bottom of the main board. Visible are a Silicon Image Sil3114C PCI to 4 Port SATA150 SATA controller, NEC D720101 USB 2.0 Hub controller, a Lattice PLD and 4 MB of Macronix flash.
Figure 4: Inside left view
The component view of the board doesn't reveal the processor, which sits under the big heatsink. Cisco went with a PMC-Sierra PM8172 System Controller and RM7035c MIPS processor in the NSS4000, but I could see only one device when I peeked under the NSS3000's heatsink. I also couldn't identify the Ethernet controller, which is under the little heatsink at photo bottom left.
Figure 5: Board view
I was surprised to find the 128 MB DDR333 SODIMM, since memory of that size is usually soldered on-board. The module near the lower left appears to be a flash disk module that, according to Cisco's spec sheet, is 256 MB. Also according to Cisco's spec, the 3000 runs an OS based on the Linux 2.6 kernel and formats its drives using XFS.
The 3000 doesn't provide root access via SSH. But for the adventurous among you, the third connector in from the photo bottom right is labeled "Linksys console access" and is probably a serial port.