HDD stopt

Hello,
I have a Emon TX V2 and Pi running whit a HDD. Therefore I use a manipulated USB stick as the HDD.
It runs several months perfect but now after a fall out of the 5v feeding it won’t start again.
I can see on the screen a lot of actions by starting up till line 6.984760 but I can’t come in the program. I check the files on another PC and tried to update them like Trystan Lea writes on 23 July.

The boot cmdline is OK

The fstab file on the HDD missing the first two lines.
proc                            /proc           proc           defaults                 0      0
/dev/mmcblk0p1          /boot            vfat            defaults                  0      2
/dev/sda2                   /                   ext4           defaults,notime       0      1
# a swapfile is not swap partition, so not using swapon/off from here on, use dph-swapfile swap(on)off for that

I tried to correct this as Trystan Lea says but the file is read-only. Is there a way to make this file changeable?

 

Regards  Frans