Yvette222

Hello, there is no way to merge 2 different physical disks.

Hello, you can try to download a disk test tool to make a health test on the drive. If possible, you can upload a screenshot to show the disk layout in Windows Disk Management.

check the hidden files and protected operating system files too.

You may need a third party tool. Based on my experience, the third party tools can do this work very well. Sound like your drive has physical issues, bad sector probably. So, it's better to make the backup as soon as possible. For the clone tool, you can try MiniTool partition wizard, easeus backup, minitool shadowmaker, aomei backup tool, Marcium reflect...Some can copy your drive directly to another one, some can help you back up the drive to a file.

There may be some possible causes: The hardware is out of date, the hard drive lacks free space, the computer is running out of memory, or the drive has physical issues such as bad sectors.

Hello, confirm you added System, Administrator and Authenticated Users the permissions. If this can't help you, you can try deleting it and make a new partition.

I tried the same thing using MiniTool Partition wizard. Both Copy Disk and Migrate os function can copy OS.

It seems the drive has heavy physical issues. Since your computers can't read it, you may need to send it to a data recovery office.

First, download MiniTool Partition Wizard as SSD Sean said. Then, start the program, right click drive D, choose the Move/Resize function to change the location between this partition and the unallocated space. After that, the unallocated space should be after partition C, you can then reopen Windows Disk Management and directly take the unallocated space to extend partition C, this is the fastest method I know.

Have you tried to update the drivers in Device Manager?

It's safe to change the name for your drives.

Minitool shadowmaker. this a new backup software, you can make use of the 30 days trial period.

Sounds like a bad drive. Have you tried disk clean in Diskpart?

The drive shows up as Unallocated means it lost all the partitions. If this is correct, just right click the Unallocated space and create the new volume to use it again. However, if you saved important data in the drive before this accident, you'd better recover data before making the new partition on it.

You can try to clone the whole old drive to the new one, in most cases, this method works. Partition tool like minitool partition wizard or easeus partition master could help you, or you can also try a backup program such as Macrium. After transferring, you can use the old drive as a data drive. I personally suggest you download a disk test tool to check whether it has bad sectors. Regarding bad sectors, running Chkdsk /r in CMD could make some repairs.