Mac operating system is one of the great featured with interactive interface operating system launched by Apple Inc. Mac has become more popular in the world. It has many versions like Mac Panther (10.3), Mac Tiger (10.4), Mac Leopard (10.5), Mac Snow Leopard (10.6), and the recent version is Mac Lion (10.7) that is to release this year. These days Mac OS X Snow Leopard is in vogue. The Mac hard drive is partitioned using HFS, HFS plus, HFSX, HFS Wrapper file systems. These volumes are managed in sectors where the initial sector is termed as boot sector and the second sector contains information about the specific Mac volume. If there is any problem with the second sector then the particular volume becomes inaccessible because Mac operating system could not collect information about the particular volume. In this situation all the data stored in the volume can not be retrieved. Therefore, you are required resolution for Mac recovery so that the inaccessible data can be accessed.
You can recover the data easily because Mac OS has a utility namely “Disk Utility” that checks the consistency of the file system, finds the disk errors and also repairs them. Sometimes, when you repair using Disk Utility to repair the erroneous disk or volumes, you may receive unexpected error messages in the middle of the operation. The error messages may be any of the following:
Error: The underlying task reported failure on exit
The volume Macintosh HD needs to be repaired
Volume needs repair
Volume header needs minor repair
If you get the error messages in spite of using Disk Utility then you need to use any third party software of Mac file recovery to get back all the files stored in the troubled volume.
Cause of the errors and inaccessibility of the data:
When the second sector, which contains the volume header, gets corrupted then it results the files inaccessible from the erroneous volume while the files are remained in the volume.
Reliable and easy solution:
You have another option to repair the volume i.e. ‘fsck’ command that is also used for checking the file system errors and fix them. If this command does not help you to fix the error then only the solution is that, format the hard drive and reinstall the Mac operating system but in this situation you need to back up your files and if you are not capable to make consistent backup then you are required to use Mac data or file recovery software to restore the lost i.e. erased data.
One such kind of software which is reliable and mostly used is Stellar phoenix file recovery for Mac. This software will recover all types of files stored in the Mac partitioned disk such as HFS, HFS+, HFSX, HFS Wrapper without any changes made in the data whether the file is deleted, lost or you have formatted the drive. It is has simple interface that can help you to restore the lost data easily.
UPDATE! New Tutorial on Updating this Virtual Machine to the latest Mac OS X 10.6.7 For the Mac App Store!: www.youtube.com Important Information: This tutorial utilizies a prebuilt VMware image, so all drivers are fully functioning. Audio, WiFi, everything works! I spent quite a lot of time creating this tutorial for you guys – Please hit the ‘like’ button and subscribe for more awesome content! Be sure to watch in HD! I apologize for the poor mic quality, I will be getting a new one shortly. Downloads: (VMware Workstation is included in the Mac OS X Snow Leopard VMware image, but I recommend purchasing it, it’s great software!) Mac OS X Snow Leopard VMware Image: bit.ly Darwin Snow Legacy ISO (AMD and Win7 64bit users): bit.ly Got Some Sort of Error? Try one of these: Q: I got this error: Mac OS X not supported for Virtualization. A: Your computer may not support virtualization. Download this tool and it’ll let you know if you computer can handle it: Intel Version: intel.ly AMD Version: bit.ly Q: My computer is supported, but it still doesn’t work. Help? A: You may need to enable virtualization in your computer’s BIOS. This should guide you through: bit.ly Q: I changed the system language and need to password to log back in. What is it? A: The default password is 123, and you may change it to whatever you wish in System Settings. Any other questions, feel free to PM me and I’ll help you as to the best of my ability. Credits to Twitter.com for linking me 
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Tags: inaccessible data, interactive interface, mac file, mac operating system, mac os x, mac volume, macintosh hd, snow leopard, third party software, unexpected error messages