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How do I know, if my drive is affected by logical failures?


Logical failure

In the event of a logical failure the hard drives electronic components and mechanical components are all working properly. Logical failures occur as a result of defective media (bad platter) or data corruption from another source (destroyed file table, etc…)

In the most extreme cases logical failure can include a hard drive that spins up fine, but is not recognized by the computer’s BIOS as being present. Some times, the computer’s BIOS can see your hard drive, but for some reason can not access the data on it. It may not be able to mount the partition or Windows may simply report that no drive is present at all.

Almost all logical failures can be recovered without the need to open the hard drive. While there are a number of logical data recover software programs on the market, its important to know why your drive has experienced a logical failure before you attempt to recover your data. If you misdiagnose a logical failure, you can cause irreparable damage to the drive in your recovery attempt.

  • Advanced Recovery Disk imaging and cloning then sector by sector scan of affected drive.


  • Deleted File Recovery Files deleted from system drives and backup drives can be recovered. Files deleted from Recycle bin are also recovered via this method. If the file size is smaller than the cluster size (clusters are commonly 32 KB, but it varies with drive size) you should get a 100% recovered file as you do not actually need the FAT entry. Larger files are usually allocated in consecutive clusters, and most data recovery software assumes this when it rebuilds files without a FAT entry. This will work for most types of files, but runs into problems with files that grow over time. Files like this are invariably fragmented, allocating consecutively is impossible due to other files taking the intermediate clusters. There are some important files that fall into this category, such as Databases, Email files, large text documents, and directories.



  • Formatted Recovery Formatted drives and partitions that may have lost/damaged file system Accidental file deletion, formatting, or partition deletion can result in a missing File Allocation Table entry.



  • RAW Recovery File system data structures of a drive have suffered serious corruption or overwriting and data recovery software cannot scan such drives. Deleted File Recovery, Complete Recovery cannot locate missing / lost files and folders. Files were deleted “long back” and cannot be identified because of over-writing to file system data structures. Recently deleted files are not recovered because of severe fragmentation. This is a common problem in FAT file system drives. RAW file recovery can discover such deleted files and folders from the temporary copies created by the application software and/or the operating system. RAW File Recovery scans every sector of your storage media for the lost files that you wish to recover and displays them in a tree according to the file type. The software scans the drive in RAW mode and can locate the files without the aid of file system data structures. It recognizes and restores many file types. This includes word processor, document, spreadsheet, graphic, internet, multimedia, source code and many such file formats. The list of file types can be viewed and selected in the software. As data is recovered bypassing file systems, folder/file structure is lost and as a result recovered files will have numerical names as opposed to file’s original names



  • File Repair Services Corrupted data recovered during any of the above means can be then processed and repaired. Files of EXCEL, ACCESS, POWERPOINT, WORD, ZIP, RAR, OUTLOOK EXPRESS AND MS OUTLOOK can undergo such repair process.


The methods discussed here have proven successful for thousands of data recovery incidents. Many recovery methods rely heavily on proper diagnosis of the problem(s) affecting the hard drive. If the wrong diagnosis is made and the wrong method of data recovery is applied, total and permanent data loss is inevitable.

Although, these are only some of the issues we as a data recoery company have come across, if your drive is experiancing any of these symptoms OR if it is not listed here, please contact support detailing the cause of the problem and issues experianced.

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Article details
Article ID: 7
Category: Hard drive, RAID arrays and NAS (Network Attached Storage) issues
Date added: 27-Mar-2011 14:03:55
Views: 13313

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