Many routers run a Linux OS and abrupt power failure can happen. Considering this - how do they handle the possibility of file system corruption caused by a power failure? If they make the system read only, how are you able to change settings?

  • I had a power failure two days ago that crashed my home made router, so I'm also interested in the answer!! (In my case it was a HW failure but anyway.)
    – Cilyan
    Feb 28, 2014 at 16:10

1 Answer 1


Routers and other small linux devices do not use hard drives.

They use different types of RAM:

  • DDR RAM as working storage
  • ROM for system image (Kernel + OS)
  • Non Volatile RAM for Settings (/dev/nvram)

In case of an crash they boot again and reinitialize the OS, so nothing get's lost.

  • Thanks for the answer, so in case of firmware update, how do you go? Oct 25, 2014 at 10:11

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