I accidentally marked my external hard drive partition as active in disk management. I meant to change the drive letter but hit the wrong button. Whoops. What are the consequences of having done that and is it possible for me to undo it? Below is a screenshot of my drives. My internal laptop HDD has C: (Windows 7 OS) and D: (extra data partition). This is regarding my other disk: Disk 1 G:
Answer
The active partition is the one used when booting from that disk. This is why your system partition on your first disk is active. It doesn't affect anything else.
If you still want to remove it, open a command prompt with Administrator privileges and start diskpart.
Step by step instructions from here:
Type LIST DISK
Type SELECT DISK n (with n being the number of the external disk)
Type LIST PARTITION
Type SELECT PARTITION n (where n is the number of the active partition you wish to make inactive)
Type INACTIVE
Type EXIT to exit DISKPART
Type EXIT again to exit the command prompt
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