My windows 10 laptop recognizes my external hard drive but cannot access it. Error message: D:\ is not accessible; The paramter is incorrect. From what I've read online, chkdsk r/ may take hours or days. Would it be wise to run chkdsk /f first, and see if that corrects the problem? Then, if the drive is still not accesible, run chckdsk /r? I haven't been able to find an answer to that question online. I'm also concerned about the possibilty of losing data on my external hard drive, which I foolishly did not back up! This is my first post on this forum, so please let me know if I've not posted this question in in the proper area. Thank you!