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.
I just got a WD My Passport drive, 1TB. It's formatted for Windows NT. How should I re-format this for Mac 10.7.5? Do I use disc utilities FAT32 or is there some other format? Not sure what 'Extended' format is and if it's suitable. Also is it OK to erase all the present files on the disc? Do I need a partition? I have no obvious use for one.
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.