Hey there guys! I have a problem, and I hope someone can help. I bought a 1TB Samsung external HDD for my sister, but she forgot to format it, so after a week I had to. I tried, but I had the following problem. When I try to format it in Disk Utility, it says that "unable to unmount disk" I had that problem before too, so i ejected it through Terminal (not sure which command worked) some diskutil force unmountDisk stuff. After that, I tried to format it again, but then the error message was "Unable to write in the last block of device" I googled a lot, found some solutions for that problem, but none of them worked for me -tried to format it through recovery mode : "Unable to unmount disk" -tried on windows dos disk utility : there was 0kb on the disk, "no data on hdd" or something like that error. -tried everything on disk utility, in terminal, still no solution. I can see the hard drive in disk utility, just no partition under it. Someone said that on Linux it's possible to format it, but I've never had Linux, and I dont want to install one to a virtual box. Only if it's my last chance. here is the disk info. I would really really appreciate if someone could help me somehow. Thank you in advance!