Error Reading Sector Hard Drive
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EMAIL Enter your email below to get exclusive access to our best articles hard drive read error boot and tips before everybody else. RSS ALL ARTICLES FEATURES ONLY TRIVIA Search How-To Geek Bad Sectors Explained: Why
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Hard Drives Get Bad Sectors and What You Can Do About It A bad sector on a hard drive is simply a tiny cluster of storage space -- a sector -- testdisk error reading sector of the hard drive that appears to be defective. The sector won't respond to read or write requests. Bad sectors can occur on both traditional magnetic hard drives and modern solid-state drives. There are two types of bad sectors -- one resulting from physical damage that can't be repaired, and one resulting from software errors that can be fixed. Types of Bad bad sector on hard drive Sectors There are two types of bad sectors -- often divided into "physical" and "logical" bad sectors or "hard" and "soft" bad sectors. A physical -- or hard -- bad sector is a cluster of storage on the hard drive that's physically damaged. The hard drive's head may have touched that part of the hard drive and damaged it, some dust may have settled on that sector and ruined it, a solid-state drive's flash memory cell may have worn out, or the hard drive may have had other defects or wear issues that caused the sector to become physically damaged. This type of sector cannot be repaired. A logical -- or soft -- bad sector is a cluster of storage on the hard drive that appears to not be working properly. The operating system may have tried to read data on the hard drive from this sector and found that the error-correcting code (ECC) didn't match the contents of the sector, which suggests that something is wrong. These may be marked as bad sectors, but can be repaired by overwriting the drive with zeros -- or
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Recovery RAID 5 RAID Controller Failure Dell Microsoft Exchange OST to PST Conversion Virtual VMWare Linux Software & Apps Software Support Data Recovery Tools Recover It All Now Speed Clone RAID Data Recovery Software RAID Stale Drive Detection Software Apps http://www.howtogeek.com/173463/bad-sectors-explained-why-hard-drives-get-bad-sectors-and-what-you-can-do-about-it/ Utilities FAT 32 File Undelete Hard Drive Verification Tool NTFS Partition Repair View it Now for SNAP OS RAID Diagnostic Toolkit Windows Surface Scanner VHD Finder About Us Certifications Contact Us Packing Instructions Service Areas Florida Bradenton Orlando Sarasota St. Petersburg Tampa New York Why DTI Data Recovery? Data Recovery Price Match Guarantee In The News How to Fix Bad Sectors on a Hard Drive The truth of the matter is; you can't repair bad sectors on a hard http://dtidatarecovery.com/how-to-fix-bad-sectors-on-a-hard-drive/ drive. Receiving ‘Bad Read’ errors or I/O errors from a hard drive is not the type of problem that can be remedied or ignored. The following is an explanation of how hard drives are designed and how a bad sector revealing itself on your system is a slippery slope to disaster. First of all, virtually every hard drive manufactured has bad sectors on it before it leaves the factory. A utility is run on the hard drive to find all the initial bad sectors and placed in a list. Every sector in the list is then remapped and saved to an area called the ‘Permanent Defect List’ or PList. It would be far too expensive to manufacturer a hard drive that every sector was perfect. The manufacturers take that into consideration so every drive that is made has a pool of sectors that is used only if a bad sector is found. This process for pointing a bad sector to a new sector is called remapping and has been used for years. Internally the hard drive firmware will take a sector that is bad and point it to another sector. The new sector is now used in place of the old one, this process is transparent to the operating system and user. The sector is placed in a list like the one created at the factory; however this list is being created at runtime an
over time. A bad sector is a sector on the disk which data cannot be written or read (read errors) due to physical damage or inconsistencies of parity checking bits on disk (CRC or http://www.cgsecurity.org/wiki/Damaged_Hard_Disk Cyclic Redundancy Check error). To recover your data, the best method is to copy/clone the drive's data to another hard disk before attempting to recover it. The new disk must be at least exactly the same size (check the number of LBA sectors) or larger; when larger, it's usually not a problem because the number of heads per cylinder and sectors per head will be the same if both disks use LBA hard drive mode. Windows may have some problems in dealing with bad sectors on a damaged hard disk, so the best solution is to use a Linux OS to copy data to another hard disk. You can also use TestDisk to help analyze the sectors copied from a hard drive with physical problems onto a good drive. Contents 1 Booting from Knoppix, a Linux LiveCD 2 Identifying an HDD's device 2.1 Identifying an error reading sector HDD's Linux device 2.1.1 Examples 2.2 Identifying an HDD's Mac OS X device 3 Disk Duplication 3.1 The classic method using 'dd' 3.2 Kurt Garloff's 'dd_rescue' 3.3 The best method: Antonio Diaz's GNU 'ddrescue' 4 Early detection of bad sectors Booting from Knoppix, a Linux LiveCD If you don't have a Linux OS installed, download the Knoppix LiveCD , a free bootable CD with a fully functional Linux OS that runs only in memory! Burn the .iso file to CD Boot from the CD-ROM At the boot prompt, type knoppix lang=us for a US keyboard/language. You are automatically logged in as the user 'knoppix' on a GUI console. Launch a Konsole/terminal(Note: Knoppix has a separate 'Konsole as root' choice, but copy/paste functions are deactivated in it, so we always recommend using the method described below for gaining root privileges from the normal user Konsole.) Knoppix comes with TestDisk, PhotoRec, dd and dd_rescue. To access hard disks, you need to run these utilities with root (Administrator) privileges. To become root from the Knoppix user account, select the Konsole and type sudo -s, then press the Enter key. Now you can use all of the powerful root commands you need for full disk access from this console. Note for users of Knoppix version 4.0.2