Hello,
after install windows 7 one partition of my hard drive is become unseen. have anyone any idea.
Hello shanu377,
If you created a partition which is not visible in your computer, maybe you need to assign a drive letter to that partition.
Right click on Computer >> Manage >> Storage >> Disk Management
Here if you see a partition with no drive letter assigned, you need to assign a drive letter.
If it's a System Reserved partition it doesn't need a drive letter, the partition is used exclusively for the boot process, otherwise jsmakkar is correct.