Hardware Secrets
Home | Camera | Case | CE | Cooling | CPU | Input | Memory | Mobile | Motherboard | Networking | Power | Storage | Video | Other
Content
Articles
Editorial
First Look
Gabriel’s Blog
News
Reviews
Tutorials
Main Menu
About Us
Awarded Products
Datasheets
Dictionary
Download
Drivers
Facebook
Links
Manufacturer Finder
Newsletter
RSS Feed
Test Your Skills
Twitter
Newsletter
Subscribe today!
Recommended
The Hard Disk Technical Guide (Micro House Technical Series)
The Hard Disk Technical Guide (Micro House Technical Series), by Micro House (Micro House), starting at $4.07


Home » Storage
Recovering Hard Disks with Bad Blocks
Author: Gabriel Torres 316,392 views
Type: Tutorials Last Updated: October 13, 2004
Page: 1 of 1

Bad block or faulty sector is the name given to a damaged area on a hard disk. It is a physical problem, i. e., the hard disk's magnetic media is defective. When we run a disk utility such as Scandisk and Norton Disk Doctor, such faulty sectors are marked with a "B".

Several users have written us asking how to proceed to recover hard disks with bad blocks. Many note that bad blocks disappear after low level formatting the hard disks.

What really happens, however, is that current physical formatting programs do not actually physically format the disk. If this should be feasible, the hard disk would be damaged, since hard disk tracks have a signal called servo that operates as a guide for the hard disk head. If we really formatted a hard disk at low level, these servos would be erased and the hard disk head would be unable to move any longer.

Low level formatting programs are utilities for detecting bad sectors and wiping the disk (for security reasons, for instance, after concluding a confidential project), not carrying out – despite their name – low level formatting.

These programs have an interesting function, which consists of updating the disk's bad sector map. When you use this option, the program scans the disk, seeking defective sectors and updating the disk's map.

When you run a high level formatting (through the Format command), this command skips the sectors contained in this bad sector table. According, there will not be any sector marked B ("Bad Block") in the FAT, although the defective sectors remain on the disk.

Defective sectors are not removed, but merely noted in this table of bad sectors, resulting in the system ignoring them (in other words, the sectors are hidden).

If new bad sectors keep occurring after running this procedure, you should get rid of the disk, as its magnetic surface is deteriorating, for some reason.

The best program to be applied in the procedure is the manufacturer's one, given on the respective utility page.

Bad Block Recovery Softwares

Print Version | Send to Friend | Bookmark Article  

Related Content
  • Everything You Need to Know About Serial ATA
  • Everything you Need to Know About ATA-66, ATA-100 and ATA-133 Hard Disks
  • How to Install Hard Drives over 8 GB in Older PCs
  • CE-ATA Standard
  • RAID6 Advantages Over RAID0 and RAID5

  • RSSLatest Content
    Gigabyte X99-UD3 Motherboard
    October 30, 2014 - 8:30 AM
    ASUS X99-A Motherboard
    October 29, 2014 - 3:00 AM
    ASUS ZenFone 5 Smartphone Review
    October 15, 2014 - 7:00 PM
    ASUS AM1M-A Motherboard
    October 15, 2014 - 4:30 AM
    ASRock X99 Extreme4 Motherboard
    October 14, 2014 - 4:10 AM
    Cooler Master Elite 130 Case Review
    October 9, 2014 - 2:46 AM
    ASUS RAMPAGE V EXTREME Motherboard
    October 7, 2014 - 2:50 AM
    ASRock Fatal1ty X99M Killer Motherboard
    October 6, 2014 - 5:40 AM







    2004-14, Hardware Secrets, LLC. All rights reserved.
    Advertising | Legal Information | Privacy Policy
    All times are Pacific Standard Time (PST, GMT -08:00)