Chkdsk might delete corrupted security descriptors, granting you access by defaulting to "Everyone: Read." This is a feature, not a bug.
Since the issue is usually that you aren't on the "guest list," the solution is to add yourself to it. You need to take of the drive. Here is the non-destructive way to do it: external hard drive not accessible access denied
Type list disk then select disk X (replace X with your disk number). Type attributes disk clear readonly and press . 6. The Last Resort: Formatting the Drive Chkdsk might delete corrupted security descriptors