You might have better help asking in the Linux community. It sounds like you need help with a disk drive, not with emulation.
Emulation
Community to talk about emulation & roms.
RULES:
1.) No bigotry
LINKS:
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Emulation Wiki - Your source for everything emulation :)
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[WIP] Emulation Links Wiki - My personal wiki for emulation links, please help contribute!
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r/Roms Megathread - Megathread of Roms
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RetroArch - RetroArch is the popular front-end to libretro which is a simple API that allows for the creation of games and emulators.
Sorry I thought you would have a recommendation for a decent external disk drive do I could back up and run my ps2 games through emulation.
Your restriction makes it hard for most people to recommend something. You're already asking a niche of a niche (emulator users who back up disc-based games), and then you're looking for a niche within that (Linux users).
Your post title also seemed to be asking about something else -- I thought you were looking for HDD recommendations (since that's a hard disk drive, but you're looking for a disc drive because English is a stupid language sometimes).