Question: As probably with most of the world, my cable modem experiences downtime intermittently each day (for maybe several minutes).

The problem is, I use my cable modem for DHCP - I have a switch connected to one of it's LAN outputs and have a number of computers connected to the switch. Everything is wired, no wireless.

When the cable modem experiences an ISP issue (for whatever reason), then my entire home LAN becomes inaccessible - I cannot ping one of my linux machines to another, my Samba shares are not accessible, and so forth.

I understand of course that I cannot make connections to the internet, but I was hoping at least my home LAN would be unaffected (i.e. home machine A communicating with home machine B).

Would anyone have suggestions on how I can insulate my home LAN operation from intermittent outages in my cable modem for the internet?

Thanks, I appreciate.

Answer: 
[DiskWarrior](https://www.alsoft.com) is quite probably the only tool that could fix the drive non-destructively. Everything else is going to just be to scavenge what it can find of your data, not fix the drive. [Testdisk](https://www.cgsecurity.org/wiki/TestDisk) is probably the only free tool worth looking at.
Another tool that is available is [**Disk Drill**](https://www.cleverfiles.com/pro.html), it has tree editions

![enter image description here](https://i.stack.imgur.com/TWaPQ.png)