I have a TOSHIBA 1TB External Hard Drive and have had it for about a year when all of a sudden I plugged the HD into my MacBook (I think I have Mavericks) it came up with 'the disk you inserted was not readable by this computer' the HD won't show up on the desktop. This has happened to my other Seagate HD before and to fix it i just reset it. But for this HD i have valuable files on it and do not wish too lose them. Is there any way I can get my HD working or my files back without having to download software or applications? thank you!