Ext4 partition makes my hard disk not being detected

Ext4 partition makes my hard disk not being detected

I think you accidentally formatted the partition on your second hard drive that uses the Windows file system. If you want to use a file system on your second hard drive that is native to Linux Ubuntu, you should check first how many partitions are there on the second hard drive. If the second hard drive has only 1 partition which is recognized and used by Microsoft Windows, you cannot format it using the Linux Ubuntu file system because the entire hard drive will be unrecognizable to your Windows operating system.

You should adjust the size of the Windows partition or shrink it to make room for the Linux partition. Once you have enough space in your hard drive, create a partition out of the space you created and format it using the Linux file system. Don’t change which partition is active because Windows might not recognize your hard drive because of the active partition.

If your second hard drive is no longer visible in your Windows platform that means you accidentally formatted the partition used by Windows. Another possible reason is if you changed the active partition and you made the Linux partition active or there is no active partition. To fix this, make sure there is one active partition in your second hard drive or make the Windows partition active.