Still, there are several third-party tools available in the market to safely modify the existing cluster size. But, it is always advisable to take backup of your important data prior to the usage of such utilities as the process may cause serious corruption to the file system and data loss or inaccessibility. However, if you still witness any instance of data loss, you can use hard drive recovery software to recover back your valuable data.

In order to describe the above situation, let us suppose that you used a third-party software to modify your hard drive cluster size. The process got completed lucidly until the next time, you tried to boot the system. The next time, when you boot your system, the booting process halted in the middle and you tend to receive  an error message. Thereafter, all your data stored in the hard drive became inaccessible. The error message can be read as below:

“A Disk read error occurred. Press Ctrl-Alt-Del to restart”

Cause:

The above error message appears because of a possible corruption to the Master Boot Record or MBR.
Note: MBR is the boot sector or the first sector of a partitioned storage media. Moreover, MBR is responsible for recognizing the partitions and loading of the operating system.

Resolution:

In order to resolve the above error, you need to boot your system with the Windows installation CD or DVD. Thereafter, at the command prompt, run the command ‘fixmbr to repair the MBR.

However, if ‘fixmbr’ command fails to repair the MBR, you have to reformat the hard disk and make a fresh installation of the operating system. Formatting erases the whole data from the hard drive and you have to restore the data from the backup. In case, backup is not available or failed to restore back the data, only any Windows hard drive recovery software can help you recover your data.

Stellar Phoenix Windows Data Recovery is a highly appreciated utility to recover hard drive data irrespective of the data loss situations. The software is compatible with Windows 7, XP, Vista, 2000, 2003 and is capable of recovering any deleted, lost, formatted or inaccessible data from FAT and NTFS file system based drives.

However, the fact is that the best of the things can also have some problem. Often, Macintosh systems flash an unusual screen and special type of error message when the operating system experiences a fatal error. Computer users have coined these messages as screens of death, in general, they are the scariest nightmares leading to the loss of previously saved precious data.

Scenario:

On a fine day, when you started your Mac computer, you got an unusual screen leaving your system halted and inaccessible. The panic aggravated as the inaccessible hard drive carries your data and to get them back you badly in need of a effective Mac hard drive recovery software.

Error:

After an unexpected system shutdown or sometimes after any software or hardware upgradation, you might witness a flashing question mark at the start up.

Probable cause:

Your Mac system cannot find the startup hard disk or any disk with the system file/folder.

Resolution:

Try to locate the missing hard disk icon on the desktop using the System Installer CD.

If the hard disk does not appear on the desktop, try to reset the RAM parameters of the system to its factory defaults, so that the computer can locate the Startup Disk.

Keep pressing the Command, Option, P and R keys during start up. The Macintosh should chime at least twice before you release the keys.

If the above measure fails, try to rewrite the device driver using a hard disk formatting program.

Remove the security programs if any, before updating/installing a new driver.

If all the above fails, then formatting only do the job keeping only hope on some good Mac hard drive recovery software  to retrieve your data.

Formatting will erase all your data in the hard disk. Hence, after the formatting or prior to this, it is always wise to opt for a third party Mac hdd recovery software. These tools are risk free and don’t meant any harm to your system other than the recovery of your lost or inaccessible data.

Stellar Phoenix Macintosh Data Recovery 4.0 is a powerful tool that is capable of extracting your precious data from the inaccessible Mac hard drive. It supports successful recovery of your data from all mac file systems such as: HFS, HFS+, HFSX, HFS Wrapper etc.

In worst conditions, such problems can compel you to use your last available data backup or a Hard Drive Recovery solution to recover lost/inaccessible data, let’s see how.

Consider a real instance when a Windows 7 user tries to upgrade his operating system without ensuring the availability of proper power backup. The user installs the upgrade and as soon as the computer shuts down, the auto installation of updates starts. Since the UPS (or Laptop battery) is not charged, the computer shuts down without letting the updates to install completely. At next attempt of starting the computer, it won’t boot resulting in below error message on screen:

“A problem has been detected and Windows has been shut down to prevent damage to your computer.”

Rebooting the computer does not help either.

Explanation

Windows installation has been damaged by an interrupted Windows update.

How to Solve?

You might be able to solve the above or similar issues using one of the following techniques:

Boot your computer using Windows install disc and use ‘ Last Known Good Configuration’ option to restore your Windows 7 computer to the last working state.

Boot your computer using Windows install disc (or repair disc) and try options like, ‘Startup Repair’

If possible, take the corrupted hard drive out of the computer and attach it to a working computer to backup the data you need. You can then safely re-install Windows.

However, if backing up the data is not possible and you do not have previous backup, use a Hard Drive Recovery Software to scan and restore the lost data. A Hard Drive Recovery application can even scan an unbootable hard drive and extract all possible information in exact format.

Stellar Phoenix Windows Data Recovery is a reliable and effective solution to recover lost/inaccessible data from hard drives. Compatible with Windows 7, Vista, XP, 2003, and 2000, this Hard Drive Recovery Software includes various advanced options like, disk cloning, disk imaging, RAW data recovery, and more.

To prevent any such hard drive damage situation, it is advisable to create an updated backup of your hard drive data on regular bases. However, there are millions of cases when the backup is created on the same corrupted hard drive, or backup file gets damaged due to logical crashes. For such situations, data recovery is possible using a third-party hard drive recovery software.

To illustrate the above case, consider a practical case where you have Windows XP based system that contains a Seagate hard drive. The drive was working fine, until you encountered the below error message at the startup of Windows:

“Non-system disk or disk error”

After the above error message appears, the operating system installed on Seagate hard drive could not boot, which further resulted in inaccessibility of hard drive data. Additionally, the same error message appears every time you try to access the hard drive.

Cause:

The above error message appears when the Seagate hard drive gets corrupted or damaged.

Resolution:

To get past above error message, you will need to take underneath actions:

1.Reinstall Windows XP operating system.

2.Restore the data from an up-to-date backup.

However, in case of unavailability of a valid backup, the formatted Seagate hard drive data can only be recovered using a commercial Hard Drive Recovery Software.

A Hard Drive Recovery utility is a dependable tool to recover all your formatted hard drive data, irrespective of the brand of the hard drive. The recovery tool serves as a self-explanatory software that requires no prior technical knowledge to perform recovery.

Stellar Phoenix Windows Data Recovery software provides fast, yet complete recovery of formatted hard drive data. The software supports recovery from almost all hard drive brands and types. Compatible with NTFS, NTFS5, FAT12, FAT16, FAT32, and VFAT file systems, the Hard Drive Recovery utility can be installed on Windows 7, Vista, XP, 2003, and 2000.

The above scenario can be explained with the below error message:

“STOP: 0xc0000221. Bad image check sum, the image user32.dll is possibly corrupt. The header check sum does not match the computed check sum.”

This error message occurs when User32.dll gets damaged. The user is neither able to view the previously saved data nor store new data post the occurrence of the above error message.

Resolution:

The resolution for the above error message is replacement of corrupt User32.dll file:

1.Reboot your computer after inserting the Windows XP CD-ROM.

2.To start the Recovery Console, press ‘R’ on the ‘Welcome to Setup’ screen.

3.In case of multi-boot, choose the required Windows XP installation.

4.Type the administrative password in case you are prompted to do so. Press Enter.

5.Type the below command at the command prompt and then press Enter:

cd windows\system32

6.Next, type the below command to rename the User32.dll file and press Enter:

ren user32.dll user32.bak

7.The new copy of the User32.dll needs to copied in System32 folder. To do so, you need to type:

expand cd-rom:\i386\user32.dl_ c:\windows\system32

8.Restart your system after exiting from the command prompt.

In most cases, the error message does not pop up after you restart your system. However, if it does, then you need to format your system. While formatting allows you to restart your system and store new data, it also deletes the previously saved data from your hard drive. To recover that deleted data, you need to use an effective Hard Drive Recovery Software. Such Hard Drive Recovery solutions can be downloaded directly from the Internet.

However, for the performance reasons, soul sectors aren’t allocated to the files in FAT file system. It takes a huge amount of overhead for keeping track of the pieces of the files that are very small in size. To overcome this problem, the hard drive is divided into the larger pieces, known as clusters or allocation units. Every cluster has various sectors. Generally, the cluster range from 2,048 to 32,768 bytes in size that represents 4 to 64 sector each.

File allocation table is the data structure that stores information about the clusters. Every cluster has entry in FAT, which describes how this is used. It tells operating system about availability of the hard drive parts and detail of the allocated parts. File allocation table is stored in hard drive area, just after VBR (Volume Boot Record). Every volume contains two copies of FAT; ostensibly, second copy is a backup and used in case of any damage.

Damage to FAT can lead to data loss because it is where all the records are stored of which part of hard drive has which files. The second copy of the FAT is used when primary copy gets damaged.

In FAT system, though, backup FAT system may not work well. The issue is that the second copy is stored next to first one. If bad sectors affect the first copy of FAT, there are strong chances that the second one is also affected. In such situations, hard drive data recovery solutions are required to extract lost data.

Hard Drive Recovery Software helps you in such cases to get your valuable data back. The applications use powerful scanning techniques to ensure quick and absolute Hard Drive Recovery in all data loss circumstances.

Stellar Phoenix Windows Data Recovery is an advanced application for assured recovery of lost data. The software is designed for Windows 7, Vista, 2003, XP, and 2000. It recovers data from FAT16, FAT32, VFAT, NTFS, and NTFS5 file system partitions.

In a practical scenario, when you boot your Windows computer, you might come across rundll error messages, similar to the following ones:

“Windows cannot find C:\Windows\Rundll32.exe make sure you typed the name correctly and try again.”

“Can’t Find rundll.exe file.”

“Rundll file missing.”

“Error loading C:\WINDOWS\SYSTEM\ctrlpan.dll. The system cannot file the file specified.”

Rundll errors commonly occurs during Microsoft Windows startup and shut down processes. They are not just the annoying issues, which appears on Windows screen; rather, the could affect stability of your Windows system and cause serious data loss. In such cases, Hard Drive Recovery is required to sort out the problem.

Root of the issue

You might encounter this problem due to corrupt or missing rundll files. The rundll files may corrupt due to virus infection, improper system shutdown, operating system malfunction and other similar reasons. Such issues may also occur due to corruption to Windows registry. Registry corruptions needs to be handled with care as improper editing of Windows registry might lead to critical situations.

Resolution

In order to sort out this behavior of Microsoft Windows, you need to format the hard drive and reinstall Microsoft Windows. This behavior replaces all damaged rundll files and fix this issue. But it also remove all of the data from your hard drive and need Hard Drive Recovery to be sorted out.

Recovery is best possible using effective and advanced third-party Hard Drive Recovery Software. The applications are capable of methodically scanning affected Windows hard drive and extract all of the lost data from it. The tools are quite safe and easy to use with read-only conduct and rich graphical user interface.

Stellar Phoenix Windows Data Recovery is the best ever made and the most advanced tool for quick and absolute recovery of all your lost data. It recovers data from FAT32, VFAT, NTFS and NTFS5 file system partitions. The software is compatible with Microsoft Windows 7, Vista, 2003, XP and 2000.

Consider a practical instance, you turn on your Windows system and the boot process fails with the following error message:

“STOP Error 0×0000008B
MBR_CHECKSUM_MISMATCH”

The error further describes four parameters: disk signature from MBR, MBR checksum calculated by operating system loader, MBR checksum that is calculated by system and reserved. After this error message, you can’t access your critical data.

Cause

The error message occurs due to MBR (Master Boot Record) checksum mismatch. When the MBR checksum calculated by the system doesn’t match with that of passed in by the loader, the system fails to boot with above STOP error. It happens when the hard disk is infected from virus.

Solution

In order to resolve the above issue, you need to follow these steps in order:

• Scan your hard disk with powerful and up-to-date antivirus software. To perform this, you need to boot your system using a write-protected disk that contains the virus scanner. These applications can help to disinfect the system.
• If your antivirus can’t fix hard disk infection, you need to reformat the hard disk and restore lost files and folders using recent data backup.

In case, data backup is unavailable or it fails to restore the required information, you can use Hard Drive Recovery Software.
Hard drive recovery applications are special tools that can recover and restore lost data in cases of logical hard disk crashes as file system corruption, operating system damage etc. With completely safe recovery process, these tools can recover all types of lost files and folders, including system and data files. Also, they provide several advanced recovery options. Such software are designed with graphically rich interface and hence you can use them quite easily.

Stellar Phoenix Windows Data Recovery is the foremost hard drive recovery software to recover the lost data including deleted e-mails. The software can recover data from corrupted, deleted, lost or formatted partitions and volumes. It supports FAT16, FAT32, VFAT, NTFS and NTFS5 file systems. The software is compatible with Windows Vista, XP, 2003 and 2000.

As a practical instance, when you attempt to install Windows Server 2003, Windows Server 2003 64-Bit version or Windows XP, you might receive the below error message:

“Setup cannot install to the selected partition.
You can only install to GPT disks on IA-64 machines and MBR disks on X-86 machines.
You can only upgrade installations on GPT disks on IA-64 machines and MBR disks on X-86 machines.
To go back to the previous screen press ENTER”

Cause

This error message occurs if both these conditions are true:

1. An operating system is already installed on the hard drive or it had an operating system, which has now been removed.
2. Hard drive is using GPT

You fail to install the required operating systems on GPT hard drives because of the following reasons:

1 On GPT hard drives, you can only set up Windows Server 2003 for Itanium-based systems.
2 You can’t set up Windows x64 based and Windows 32-bit operating systems on GPT hard drives.

Solution

You need to convert your GPT hard drive to a MBR hard drive. You can use Disk Management snap-in or diskpart command for it, if an operating system is already installed. You can also delete all existing hard drive partitions using Windows Setup and opting for the option to convert the partitioning scheme. In Windows Server 2003-based systems, it must have Windows Server 2003 Service Pack 1 installed. After this, you can restore lost data from backup. If the backup is invalid (viz. causes one or more errors during restoration) or incomplete, you should use Hard Drive Recovery tools to recover your critical data.

Stellar Phoenix Windows Data Recovery is complete and robust hard drive recovery software. It is equipped with advanced features like disk cloning, drive imaging, RAW Recovery, Drive Status and more. The software supports FAT16, FAT32, VFAT, NTFS and NTFS5 file systems. This Hard Drive Recovery tool is compatible with Windows 7 (currently in RC1), Vista, XP, 2003 and 2000).