Apart from the normal boot mode, in the Mac systems, there is another special boot mode called 'TDM' or 'Target Disk Mode'. The Mac systems, which have been started in the TDM boot mode, behaves as FireWire drives. The Macintosh system started in TDM mode, does not boot and can get attached to any FireWire port of any other system with the options for formatting, partitioning or transfer of files. However, if you try to mount the disk that has been started in TDM mode, it fails to boot and the data in the drive becomes completely inaccessible. In such a situation of data loss or inaccessibility, you have to opt for any Mac recovery software to recover and restore your valuable data from the troubled Mac drive.
In the above instance of data inaccessibility, when the Mac drive fails to mount, you may encounter an error message, which can be read as below:
“You have inserted a disk containing no volumes that Mac OS X can read”
The error dialog box that you receive may contain three options, such as Initialize, Ignore and Eject, among which you must either opt for the option Eject or Ignore to close the error dialog box.
Cause:
The reason can be pretty simple that the drive must have been formatted in a non-Mac format, including any FAT or NTFS file system type. The Mac OS X can not be able to recognize the disk drives, which has been started under TDM mode and formatted with NTFS or FAT32 file systems.
Resolution:
In the above instance of data inaccessibility, when the Mac drive fails to mount, you may encounter an error message, which can be read as below:
“You have inserted a disk containing no volumes that Mac OS X can read”
The error dialog box that you receive may contain three options, such as Initialize, Ignore and Eject, among which you must either opt for the option Eject or Ignore to close the error dialog box.
Cause:
The reason can be pretty simple that the drive must have been formatted in a non-Mac format, including any FAT or NTFS file system type. The Mac OS X can not be able to recognize the disk drives, which has been started under TDM mode and formatted with NTFS or FAT32 file systems.
Resolution:
In order to resolve the above case, you need to format the hard drive in a Mac Os X supported file system. You have to connect the drive to any Intel-based Macintosh system and format using the Disk Utility.
However, with formatting and a fresh installation of the operating system, all your data from the drive will be lost and you have to restore them back from a valid backup. If you do not have any valid backup or failed to restore from the backup due to any unresolved issue, then, the only option, which can help you recover back your seemingly lost data is to run any Mac recovery utility.
