Hi guys. My name is levi and my hard drive has a problem. I have both windows and ubuntu installed on my laptop's hard drive. One day i switched off my laptop and now when i switch it back on it loads up to the grub menu but when i click on windows it doesn't load. It gets stuck at the black screen with a flashing underscore. the same case with ubuntu except ubuntu loads command prompt. Today i removed the hard disk and connected it to a desktop using a USB cable. The hard disk is visible but i cant access it or its files. My question is what happened to the hard disk and how can I fix it? I put another hard drive in my laptop and it works ok. Please help me recover my hard drive. Thanks.