How does re-installing an operating system on a primary drive impact data on mounted filesystems?

I have a machine with 3 separate SSD drives:

• sda - Holds the operating system itself (Ubuntu)
• sdb - Personal Data
• sdc - Personal Data

sdb and sdbc are mounted drives.

Say I planned on wiping the OS from sda and installing a new operating system. I'd then (re-)mount the 2 data drives:

1. Would my files still be readable?
2. Would my files still have the same permissions / owners (assuming those users exist on my new OS user space)?
3. Would it matter if I installed Ubuntu or switched to a totally different distro like Arch?

Thanks!

I hope this question will be migrated, but it doesn't belongs to Server Fault. Questions on Server Fault must be about managing information technology systems in a business environment. Home and end-user computing questions may be asked on Super User.

1. Yes. Just make sure you wipe/install your OS on correct drive.
2. Yes. But note that Linux filesystems store permissions as numbers (UID/GID), not as names. That means that your new users and groups should also match their IDs. You can obtain those on current OS by reading /etc/passwd and /etc/group files.
3. It won't matter as long as you are reinstalling from scratch.