Yes, you can use these drives in the same RAID. Both are CMR type of drives https://nascompares.com/answer/list-of-w...rives-hdd/
You can only switch to SHR2 if you have 4 drives https://kb.synology.com/en-au/DSM/help/D...?version=7
You could technically remove the drive and set up a NAS with 3 other drives. Then connect removed drive via USB docking station to copy data back.
Otherwise, you can simply go to storage manager and expand from single drive to 4 drives.
Add Drives to Expand the Storage Pool Capacity | DSM - Synology Knowledge Center
kb.synology.com
I hope this helps.
You can only switch to SHR2 if you have 4 drives https://kb.synology.com/en-au/DSM/help/D...?version=7
You could technically remove the drive and set up a NAS with 3 other drives. Then connect removed drive via USB docking station to copy data back.
Otherwise, you can simply go to storage manager and expand from single drive to 4 drives.
Add Drives to Expand the Storage Pool Capacity | DSM - Synology Knowledge Center
kb.synology.com
I hope this helps.