Though the advance computer systems, such as Mac, UNIX etc are robust in their design and storage structure, still situations leading to data loss are almost inevitable. This is the reason that various operating systems have inbuilt commands that facilitate certain amount of data security or preventive measures to save your data prior to a possible damage to the storage media. The ‘dd’ command is such an example.
The command can be used to make an exact image of the data from the dying hard drive and can be restored later on. However, under unfortunate incidents, the disk image refused to be mounted and it seems as if all your data is lost. These are the extreme conditions, where you have to think over technologies like Mac hard drive recovery or Mac recovery software.
Facts about ‘dd’ command:
This is a common piece of UNIX command with the purpose of copying and converting raw data.
‘dd’ is usually used to copy a specified number of bytes or blocks of data and similarly byte level conversion, such as EBCDIC to ASCII conversion. Though this command is used to backup the boot sector of a hard disk, still you can also use it to copy the entire partition or disk. ‘dd’ command copies the information about deleted and formatted data as it copies byte by byte, whereas the usual ‘cp’ command misses it. Moreover, this command can make a copy of the specified data irrespective of the data type or the file system.
your data in the Mac OS X based volume is inaccessible and you have sensed some problem with your hard drive. You accessed your drive through your UNIX OS and made an image of your data by using the ‘dd’ command.
Later, when you try to mount the image and restore the data on your Mac OS X, it showed an error message and stuck. The error message read as:
“No mountable file systems”
As the data image is refused to be mounted, you cannot restore the your data, through the image, you had made by the ‘dd’ command.
Cause of the problem: The most likely reason is that the data image made by the command is corrupted.
Now, if you have taken backup of your data, then you can restore the same from the updated backup. In the absence of a valid backup, try using Mac recovery software.
The Mac recovery software are developed with advanced techniques to recover all your deleted, corrupted or inaccessible data from a troubled hard drive. You can easily use these software without any prior knowledge as they come with detailed instructions for each step.
Stellar Phoenix Macintosh Data Recovery is a Mac hard drive recovery tool, through which, you can recover all your lost or inaccessible data from your corrupted hard drive without much effort. The software supports Mac OS X 10.3.9, 10.4, 10.5, 10.6 and recovers your data from HFS, HFS+, HFS Wrapper, FAT file system volumes.