From NAS-Central Buffalo - The Linkstation Wiki
- EM Mode officially means Engineering Mode, but we also call it Emergency Mode. If the LinkStation encounters a serious error with the hard drive or file system it will enter EM Mode. When in EM mode the LinkStation loads its file system from the flash instead of the hard drive. The LinkStation can be seen on the network with the IP address 192.168.11.150 but can only be reached via ping or the LinkStation firmware flasher. The firmware updater is able to find the Linkstation, only if UDP-Port 22936 is open. This is always true in EM Mode. An FTP server appears to be running but we currently don’t know the username/password and what can be done via FTP.
- You will need to correct the hard drive error and re-flash the firmware to get the LinkStation out of EM mode. Some users have reported success with installing a blank hard drive (in ext3 format) and flashing the firmware.