As mentioned above, you can easily change the non-primary partition's drive letter. In Windows, you just go to Disk Management and right click the partition. You don't need to format it to change the drive letter, and there is no risk of losing your data by changing the drive letter. Just know that anything referring to that drive letter will be broken when you change it.
You can technically change your primary drive letter but it is complicated and can cause you a lot of problems. Your best bet is to do it when you're first installing your OS. If you want to do it after the fact, then I suggest you finding a good guide online for your OS and backing up your data before even attempting this. I've done it before and it isn't pretty.
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September 16, 2013 8:45:01 AM
Dear All, i have a problem i need to make the letter of primary and secondary partitions of my HDD to any letters else instead of C: and D: please help.
once you accidentally put something (hidden files) in secondary partition which are part of OS , you cant change the letter or format it anymore in disc management.