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If you're not worried about stuff being recovered, just right the click the drive in Windows and select "format..." and follow simple directions (couple clicks). The drive will appear as empty in Windows.
Or you can just leave it as is and let your brother wipe the drive when he reinstalls Windows.
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Delete information stored on hard disk drives (HDDs) in PC laptops, desktops or servers. Plus, remove viruses/spyware from Microsoft Windows installations. https://dban.org/
Use the boot override in BIOS to force the PC to boot the Windows 10 installation drive, then on the "Where do you want to install Windows?" screen you can delete all the partitions on the drive. Even if you don't delete the partitions the Windows installer will format these partitions automatically and reuse them.
Then just add it in as a 2nd drive (not being the Operating System or Boot drive).
Go under your 'My Computer' (showing the drives list) > Right-click the drive > Format
Ensure it's formatted to the correct format (default would be NTFS with 4096 byte allocation unit size). Untick 'Quick Format'. Optionally give the drive a 'Volume Label' or leave that blank, doesn't matter if you want to call it something or not. Double check there's nothing you want to keep on it. Then click on 'Start'.
Once ready to look at an older secondary drive, delete all available partitions on it via disk manager. Zero Wipe it the rest of the way via CCleaner, tools, disk wiper, entire disk...
when prompted to install windows, first format both drives one at a time and then install windows OS on SSD.
after installation is finished, turn off pc and unplug from wall socket. you can now remove hdd to transfer to other pc.
Where as a quick format is just for a single partition and leaves all that hidden stuff still on the drive
Once drive is 100% wiped, then create a single partition and format as... MBR, NTFS and 4K clusters
You can use HDDErase from CMRR or hdparm. I've used both and HDDearse is easier to use and DOS based. Just make a bootable DOS usb. I'm a Linux user so prefer hdparm but it's a bit harder to use and if you mess things up you will ruin your drive.
https://ata.wiki.kernel.org/index.php/ATA_Secure_Erase
https://cmrr.ucsd.edu/_files/secure-erase-qa.doc
After that, degaussing, or a hammer!
When you delete a file or format a drive it really doesn't change all the 0's and 1's, it just tells your computer that the space is free without actually 'erasing'or writing over the data. This is usually fine for 98% of people who just want to clear it out and start fresh with an empty hard drive. If you took that drive to a data recovery place though, they could still read the data that was 'deleted' because the 1's and 0's are still there. This is how police can recover data, even if the hard drive was smashed into pieces.
Sometimes though, especially in government and other places where security is extremely important, they want to make sure that the data can never be recovered so they use a program that actually writes over the old data repeatedly to be super secure.
TLDR you can format the drive. It's really easy to do in Windows, especially if it's not the drive with the OS installed on it. Just go to 'This PC', right click on the drive, and click 'Format'