Step 1. Install and run AOMEI Partition Assistant Standard. Right-click the partition you want to extend, right-click "Advanced" and select "Merge Partitions". Step 2. Then, tick the box before the unallocated space. Step 3. After that, click "Apply" to execute it. The indication is that your drive has failed and you would need to replace it before you could reinstall Windows. To check the drive you have to follow these steps: 1) Press Esc key repeatedly, several times a second, while rebooting the laptop. Do NOT hold the key down, just press it over and over. Here is how to recover lost external hard drive data. Step 1. Right-click the unallocated disk space on the external disk and choose "Recover Lost Files" option. In DiskGenius, unallocated disk space is marked as "Free" with grey color, and it is easy to distinguish it from other partitions. Step 2. It`s a brand new drive, no partitions. The only thing you may have to do is initialize it (the new drive) if it asks. And it should ask. When you get to the page that shows the drive is all unallocated space, all you should have to do is click next. Make sure the unallocated space is highlighted. Attached Thumbnails. Click on Custom Install, and then in the drives section click on delete to clean off the partitions, and once the disk is nothing but free space, select that drive. If you are unable to see that stuff, get your hands on a bootable linux distro, boot off the CD, and run gparted to clean off the disk partitions. Hi everyone. Just a problem I have with my hp stream 14 laptop I am trying to install windows 10 with a usb stick and when it's says where would you like to install windows and I only have one drive which is drive 0 unallocated space so I click it but it Sayed cannot install windows in the location you chose and I have no other drives listed so I don't what to do at this point. GaucEC.