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Create a password to keep others from accessing the files on the drive.For My Passport SSD and My Passport Go also refer to the following article: Answer ID 29790: WD Backup & WD Security: Does Not Detect My Passport SSD or My Passport Go.For more information, please refer to Answer ID 4677: Invalid Password or Forgotten Password Message on WD Security. THE DRIVE WILL NEED TO BE ERASED BEFORE IT CAN BE USED AGAIN. If the password has been forgotten, you will lose access to your data.The WD Security software uses the set password to electronically lock and unlock the drive.Select a Partition layout, then Options… & set to GUID Partition Table.WD Security allows password protection of external drives that support 256-bit AES hardware encryption from unauthorized use or access. Bottom right it will tell you the partitions scheme. You can only change from MBR to GUID by completely erasing the drive & starting over… You would need to go to Disk Utility & check the drive is formatted as not only Mac OS X Extended, but that the underlying structure is GUID Source: Macworld - Time Machine tips and troubleshootingĪpple's KB doesn't seem to quite be so explicit - OS X Yosemite: Disks you can use with Time Machine So if you have, say, a 750GB or 1TB drive, you must repartition it to use the GPT or APM scheme before it can work with Time Machine. Although OS X supports MBR, there’s a catch: Mac OS Extended volumes can be no larger than 512GB on a drive partitioned with the MBR scheme. Drives originally set up for use on Windows usually use the Master Boot Record (MBR) scheme, as opposed to the Apple Partition Map (APM) scheme, the default for PowerPC-based Macs, or the GUID Partition Table (GPT) scheme, the default for Intel Macs.

The partition map scheme describes how the drive stores its volumes. This article is quite old, but I think is probably the reason…