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QNAP TS231P2 :How to clean up / format working old disks from RAID1 after replacing both? Ex by going 2x2TB->2x6TB?

#1
Hello! I am new to NAS, so apologies. Let's say, I'd like to extend my current RAID1 in my Qnap NAS by replacing smaller disks with larger ones. 2x2TB - 2x4TB or 2x6TB. I checked qnap manual and understand the procedure "replace disk one by one" but it does not say in what state the old disk will be? I understand the data will remain there? What if I would like to resell them to a friend? I also have a desktop PC, do I need, after replacement insert them one by one to my PC and format/clean up them? Will any software be able to read them? Is it possible perhaps to do this procedure while they are still on my NAS? I mean, clean disk one, replace, wait for raid rebuild, clean disk 2, replace, wait for raid rebuild? Thank You and stay in good health during those awful times!
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#2
Yes, this is correct. You will need to replace disks one by one. Once you have finished you will need to use good formatting/erasing software to wipe the data. Here is a list of top free erasing apps: #1 MiniTool Partition Wizard.#2 DBAN. ...#3 Disk Wipe. ...#4 KillDisk. ...#5 CCleaner. ...#6 PCDiskEraser. ...#7 CBL Data Shredder. ...#8 Eraser.Since you have a RAID on those disks, other computer will not see the data in a simple form. Drive would need to be connected together to a Linux system and accessed as a RAID. Or you can keep these drives for a backup purposes.
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