Using a 4TB Drive on Pi

I have a 4tb HDD hooked up to my Pi via a USB container https://forums.raspberrypi.com/viewtopic.php?t=345542 Seems like I am formatted to MBR (Idk what this means I know sysadmin but not storage management) and limited to 2tb, how can I "change to MBR" (without formatting hopefully but doable) or otherweise make all 4tb available? Trying to use this as a seedbox, plex, and backup NAS

You want the HDD as your main drive (OS) or just as a secondary one, MBR is for Boots if i can recall

MBR = Master Boot Record. https://en.wikipedia.org/wiki/Master_boot_record "The MBR holds the information on how the disc's sectors (aka "blocks") are divided into partitions and each partition contains a file system."

And yes you can convert a MBR to a GPT. Check out https://recoverit.wondershare.com/partition-tips/convert-mbr-to-gpt-linux.html But a caution, the risk to destroy the data is always higher in this kind of processes, so a backup of data is always recommended.

thanks for the advice

unjfortuantely ended up in a situation like this, old MBR is intact but GPT is damged and I'm currently tryna figure out how to undo that or recover the data, gpt "didn't" extend to 4tb and instead looks completly wiped from any fileviewer

And you did a backup as I adviced?

nope, didn't have another drive to hold the space or anything TOO important just a ton of torrents. is there a way to restore the MBR and try again / another method atp?

Not what I know about