Disk Utility says the format is Mac OS Extended (Journaled). I do actually have it plugged into my TimeCapsule and I use it normally as Network Drive. However I got a new usb hub and unplugged the device from the TimeCapsule and connected the drive to the new hub instead of directly to the one and only usb slot on the time capsule. I am using the newest MacBook Air, Mac OS X 10.7.3. My external drive is a Samsung M2 Portable 3 Media, 500GB. I might have accidentally disconnected the hard drive without ejecting it first. Now when I run disk utility and click Repair Disk it says: 'Disk utility can't repair this disk.
![Repair Repair](http://cdn.osxdaily.com/wp-content/uploads/2011/04/create-new-partition-mac.jpg)
Product: WD My Passport Ultra 1TB Operating Systems: Mac & Linux I recently used my WD Passport for a linux system. I formatted this drive in linux to ext4. Now I want to use this drive for my mac again but am having problems formatting this drive using disk utility to hfs. For some reason I can read/write and format this drive fine on linux. Also when viewing this drive in Disk Utility there are multiple instances of this drive. Unmounting disk Creating the partition map Waiting for partitions to activate Formatting disk5s1 as Mac OS Extended (Journaled) with name Untitled newfshfs: WriteBuffer: pwrite(3, 0x104ae4000, 1048576, 331354112): Input/output error newfshfs: write (sector 647176): Invalid argument Mounting disk Could not mount disk5s1 after erase EDIT #1 Palaeologus helped me find a solution to formatting the drive. Sudo su diskutil list cat /dev/random /dev/diskX Look for the drive and replace X with drive number.
Then format drive as FAT. Diskutil eraseVolume ExFAT MyName diskX Once again replace X with disk number. The drive is now assessable. However I can only format the drive to FAT and not JHFS, formatting to JHFS returns the same error as described at the top of the post.