kaos_engr is wrong. You CAN run Linux on a modded Xbox. Although since you also asked about REPLACING the hard drive: I don’t know whether you have to use the original hard drive or can use any IDE hard drive. But Linux is apparently possible on a modded Xbox. See here, and there are more resources on the web too, just search the web for “original Xbox linux”: https://en.wikipedia.org/wiki/Xbox_Linux

As for Windows on an original Xbox. I’m sure I read once that proper drivers wouldn’t exist. Because nobody would have written them. Certainly Microsoft didn’t want you putting Windows on your Xbox. However I just came across this video of someone allegedly running Windows 98 on an Xbox. I’m not sure if they’re somehow virtualising Windows using Linux or something. Maybe have a look and figure out what’s going on: https://www.youtube.com/watch?v=erk_XE-D...

But Linux on an Xbox does look possible, IF you have a modded Xbox.

I’ve read that “battery calibration” isn’t necessary on modern lithium polymer batteries, and in fact can be damaging to them? Since discharges all the way to 0% are apparently bad for the battery. Apparently it was more of a requirement of old nickel-based batteries (according to this page).

Although actually I’ve just found this article which seems enlightening:

“[More and more batteries have a digital calibration tool built into them. These “smart batteries” supposedly reduce the need to calibrate, though it’s still recommended… [i]f you see the battery percentage on your phone jump around a lot… You don’t want to do this too often though. It’s actually bad for lithium-ion batteries to be regularly drained all the way to 0%.”

So perhaps the best advice is that your phone’s battery readings might sometimes benefit from a calibration, but try and do it as infrequently as possible since it takes a toll on the battery?