Data loss is a horrible reality that any computer user may face at any point of time. It may happen to even the most secure and the safest computer, nevertheless of hardware and software configuration. To prevent such situations and create regular backup of your valuable data, Mac OS X 10.5 Leopard and 10.6 Snow Leopard operating systems offer Time Machine utility. This utility backs up your precious data automatically at scheduled time and supports both internal and external storage media. Backup is the most significant way to ensure absolute Mac data recovery in all data loss cases.

Although, Time Machine application supports external hard drives to store backup data, but the drive must be formatted using HFS+ file system in Journaling mode. In case external hard drive is using the Master Boot Record (MBR) partition type, then you may encounter serious issues...

Hard drive partitioning is a method to divide your computer hard disk into various partitions, which work like separate drives. Partitioning helps you easily manage your valuable data and keep your data separated from the operating system. It helps you prevent data loss in case of operating system corruption and avoid Mac data recovery needs. Mac OS X operating system supports various disk partitioning schemes.

Different partitioning schemes of Mac OS X operating system can cause problems sometimes. Intel-based Macintosh computers enable you to install the operating system on hard drives that are partitioned using GUID scheme. On the other hand, PowerPC based machines supports only Apple Partitioning Scheme.

When you try to install Mac OS X operating system on a hard drive or hard drive volume that does not have native partitions as per the type of system processor, you may get the following error message:

"You cannot install Mac OS X on this volume. Mac OS X cannot start up from this volume."...

Though the Mac systems are very much efficient in accomplishing the everyday works and are built with all the advanced technology, still it does not mean that one can not face any instance of data loss with Mac. Mac users do face data loss in spite of taking strict measures and moreover, sometimes, data loss can be so accidental that it may not be prevented. In all such tragic and unfortunate situations, Mac data recovery is a technology to recover all your valuable data back.

Sometimes, with any unexpected power failure, if the Mac system suddenly shuts down, it shows an error message, the next time you try to boot the system. With the error message popping up every time you try to start-up, the system may fail to boot further.

The error message may be as follows:

"-127 error disk could not used/found"...

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 data 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 Mac hard drive is designed to be divided into multiple number of partitions using HFS Wrapper, HFS, HFS plus file systems. The file system based volumes are managed in sectors. The initial sector is dedicated to the boot block, through which, the Mac OS X learns about the file system and boots. The second sector contains the volume header(in HFS plus) or the Master Directory Block (in HFS) which stores all the information about the particular Mac volume. Therefore, if there is any problem with the volume header or the Master Directory Block, Mac OS X can not fetch information about the volume and the particular volume becomes inaccessible. Under such a situation, you need to take the help of Mac recovery to recover your inaccessible data back.

For any kind of system errors in Mac OS X, Apple has included an utility, named 'Disk Utility', which can help you locate the disk errors, checks the consistency of file system and repair them as well. Sometimes, while trying to repair the troubled disk/volume with the help of Disk Utility, error messages appear on the screen ceasing the operation in the middle. The error message may be read as below:...

Time Machine is a data back-up utility developed by Apple for the Mac OS X based systems. This utility was introduced with the release of Mac OS X 10.5 and works with Time Capsule, USB hard drives and FireWire (IEEE 1394a/b) drives. This advanced utility can be immensely helpful in taking incremental backup of your valuable data to an external device and allows you to restore the system at any later date. However, if any problem arises in the Time Machine itself, resulting in the loss or inaccessibility of your important data, then you have to take the help of any Mac data recovery software in order to recover back the seemingly lost data.

You added a new hard drive to your old backup and mapped the Time Machine to it. Once, you started taking a new backup, initially it ran nicely until an error message on the screen, after which all the backup disks mapped to the Time Machine became inaccessible. The error message that you received may be as below:...

Apple has done lots of changes in terms of adding new features and upgradation of old, the launch of HFS plus is an example of the same. HFS+ has been developed to replace the old version and is popularly known as the Mac OS Extended. Though HFS+ has been improved upon HFS in many grounds, it is equally susceptible to corruption following any system crash, unexpected system shut down, application malfunction, virus/malware intrusion etc. Whatever be the reason, once, the file system gets corrupted, the Mac system may not boot properly, leading to the complete inaccessibility of your valuable data. In order to recover back the seemingly lost data, such a situation can only be dealt by any Mac recovery utility.

A brief about HFS plus: ...