MJS COMPUTERS - Newcastle upon tyne, Gosforth, North East and Northumberland - the number one Pc and Laptop Repair specialists brings a responsive professional computer support service to both domestic and business customers.
MJS COMPUTERS was founded by Mike Searle who has more than 15 years experience in building and troubleshooting computers and systems.
We provide both home and office pc repair services in newcastle and all of the north east of england
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WE HAVE PC ENGINEERS AND LAPTOP REPAIR SPECIALISTS WHO PROVIDE ON SITE COVER IN THE FOLLOWING AREAS....
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professional pc repair to small businesses and home users
We are dedicated to provide a professional, fully comprehensive range of PC services to small businesses and home users.
Recovering data after physical damage
A wide variety of failures can cause physical damage to storage media. CD-ROMs can have their metallic substrate or dye layer scratched off; hard disks can suffer any of several mechanical failures, such as head crashes and failed motors; tapes can simply break. Physical damage always causes at least some data loss, and in many cases the logical structures of the file system are damaged as well. This causes logical damage that must be dealt with before any files can be salvaged from the failed media.
Most physical damage cannot be repaired by end users. For example, opening a hard disk in a normal environment can allow dust to settle on the surface, causing further damage to the platters and complicating the recovery process. Furthermore, end users generally do not have the hardware or technical expertise required to make these repairs; therefore, costly data recovery companies are consulted to salvage the data. These firms often use Class 100 cleanroom facilities to protect the media while repairs are being made.
Despite this, there are many accounts of users getting a bad disk going long enough to pull their data off, often via slightly bizarre tricks. These include making the drive cold (in the freezer) or spinning it manually on the ground, both actions being used to unstick a jammed platter. Most data recovery professionals recommend against the use of tricks such as these, as they can cause additional physical damage to the drive if done improperly (and in many cases, even when done properly).
Recovery techniques
Recovering data from physically damaged hardware can involve multiple techniques. Some damage can be repaired by replacing parts in the hard disk. This alone may make the disk usable, but there may still be logical damage. A specialized disk imaging procedure is used to recover every readable bit from the surface. Once this image is acquired, the image can be analyzed for logical damage and will possibly allow for much of the original filesystem to be reconstructed.
Hardware repair
Examples of physical recovery procedures are: removing a damaged PCB (printed circuit board) and replacing it with a matching PCB from a healthy drive (this often entails the movement of a microchip from the original board to the replacement), changing the original damaged read/write head assembly with matching parts from a healthy drive, removing the hard disk platters from the original damaged drive and installing them into a healthy drive, and often a combination of all of these procedures. All of the above described procedures are highly technical in nature and should never be attempted by an untrained individual. All of these procedures will almost certainly void the manufacturer's warranty.
Disk imaging
The extracted raw image can be used to reconstruct usable data after any logical damage has been repaired. Once that is complete, the files may be in usable form although recovery is often incomplete. According to research by the Defense Cyber Crime Institute there are also tools available to law enforcement and government agencies only such as ILook IXimager.
Open source tools such as DCFLdd v1.3.4-1 can usually recover all data, with exception of the physically damaged sectors. (It is important that DCFLdd v1.3.4-1 be installed on a FreeBSD operating system. Studies have shown that the same program installed on a Linux system produces extra "bad sectors", resulting in the loss of information that is actually available.)
Typically, Hard Disk Drive data recovery imaging have the following abilities. Communicating with the hard drive bypassing the BIOS and operating system that are very limited in their abilities to deal with drives that have "bad sectors" or take a long time to read. Reading data from “bad sectors” rather than skipping them (using various read commands and ECC to recreate damaged data). Handling issues of unstable drives, such as resetting/repowering the drive when it stops responding or skipping sectors that take too long time to read (read instability can be caused by minute mechanical wear and other issues). Pre-configuring drives by disabling certain features, such a SMART and G-List re-mapping, to minimize imaging time and the possibility of further drive degradation.
Recovering data after logical damage
Far more common than physical damage is logical damage to a file system. Logical damage is primarily caused by power outages that prevent file system structures from being completely written to the storage medium, but problems with hardware (especially RAID controllers) and drivers, as well as system crashes, can have the same effect. The result is that the file system is left in an inconsistent state. This can cause a variety of problems, such as strange behavior (e.g., infinitely recursing directories, drives reporting negative amounts of free space), system crashes, or an actual loss of data. Various programs exist to correct these inconsistencies, and most operating systems come with at least a rudimentary repair tool for their native file systems. Linux, for instance, comes with the fsck utility, Mac OS X has Disk Utility and Microsoft Windows provides chkdsk. Third-party utilities such as The Coroners Toolkit and The Sleuth Kit are also available, and some can produce superior results by recovering data even when the disk cannot be recognized by the operating system's repair utility. Utilities such as TestDisk can be useful for reconstructing corrupted partition tables.
Some kinds of logical damage can be mistakenly attributed to physical damage. For instance, when a hard drive's read/write head begins to click, most end-users will associate this with internal physical damage. This is not always the case, however. Often, either the firmware on the platters or the controller card will instead need to be rebuilt. Once the firmware on either of these two devices is restored, the drive will be back in shape and the data accessible.[citation needed]
[edit] Preventing logical damage
The increased use of journaling file systems, such as NTFS 5.0, ext3, and XFS, is likely to reduce the incidence of logical damage. These file systems can always be "rolled back" to a consistent state, which means that the only data likely to be lost is what was in the drive's cache at the time of the system failure. However, regular system maintenance should still include the use of a consistency checker. This can protect both against bugs in the file system software and latent incompatibilities in the design of the storage hardware. One such incompatibility is the result of the disk controller reporting that file system structures have been saved to the disk when it has not actually occurred. This can often occur if the drive stores data in its write cache, then claims it has been written to the disk. If power is lost, and this data contains file system structures, the file system may be left in an inconsistent state such that the journal itself is damaged or incomplete. One solution to this problem is to use hardware that does not report data as written until it actually is written. Another is using disk controllers equipped with a battery backup so that the waiting data can be written when power is restored. Finally, the entire system can be equipped with a battery backup that may make it possible to keep the system on in such situations, or at least to give enough time to shut down properly.
Recovery techniques
Two main techniques are used to recover data from logical damage. While most logical damage can be either repaired or worked around using these two techniques, data recovery software can never guarantee that no data loss will occur. For instance, in the FAT file system, when two files claim to share the same allocation unit ("cross-linked"), data loss for one of the files is essentially guaranteed.
Consistency checking
The first, consistency checking, involves scanning the logical structure of the disk and checking to make sure that it is consistent with its specification. For instance, in most file systems, a directory must have at least two entries: a dot (.) entry that points to itself, and a dot-dot (..) entry that points to its parent. A file system repair program can read each directory and make sure that these entries exist and point to the correct directories. If they do not, an error message can be printed and the problem corrected. Both chkdsk and fsck work in this fashion. This strategy suffers from two major problems. First, if the file system is sufficiently damaged, the consistency check can fail completely. In this case, the repair program may crash trying to deal with the mangled input, or it may not recognize the drive as having a valid file system at all. The second issue that arises is the disregard for data files. If chkdsk finds a data file to be out of place or unexplainable, it may delete the file without asking. This is done so that the operating system may run smoother, but the files deleted are often important user files which cannot be replaced. Similar issues arise when using system restore disks (often provided with proprietary systems like Dell and Compaq), which restore the operating system by removing the previous installation. This problem can often be avoided by installing the operating system on a separate partition from your user data.
Zero-knowledge analysis
The second technique for file system repair is to assume very little about the state of the file system to be analyzed, and using any hints that any undamaged file system structures might provide, rebuild the file system from scratch. This strategy involves scanning the entire drive and making note of all file system structures and possible file boundaries, then trying to match what was located to the specifications of a working file system. Some third-party programs use this technique, which is notably slower than consistency checking. It can, however, recover data even when the logical structures are almost completely destroyed. This technique generally does not repair the underlying file system, but merely allows for data to be extracted from it to another storage device.
Recovering overwritten data
Further information: Data remanence
When data has been physically overwritten on a hard disk it is generally assumed that the previous data is no longer possible to recover. In 1996, Peter Gutmann, a respected computer scientist, presented a paper [3] that suggested overwritten data could be recovered through the use of Scanning transmission electron microscopy. In 2001, he presented another paper [4] on a similar topic. Substantial criticism has followed, primarily dealing with the lack of any concrete examples of significant amounts of overwritten data being recovered. [5] [6] To guard against this type of data recovery, he and Colin Plumb designed the Gutmann method, which is used by several disk scrubbing software packages.
Tools
Boot media
It is often the case that data recovery and forensics operations cannot be done on a running system. As a result, it is common to use a specialized boot disk, Live CD, Live USB, or any other type of LiveDistro containing a minimal operating system and a set of repair tools. When floppy drives were still common, the boot disk was typically a very minimal LiveDistro on a floppy disk (such as the Mac OS Classic Disk Tools disk, standard with every system release). However, as operating system complexity has increased, it has become more common for developers to include recovery tools on the same media as the OS installer. There are also many purpose-built LiveDistros that include advanced data recovery and forensics tools.
Laptop Repair and PC RepairNORTH EAST OF ENGLAND INCLUDING SUNDERLAND, NEWCASTLE, HEXHAM, BOLDON COLLERY, CLEADON VILLAGE
Laptops are not just Computers but they are highly sophisticated electronic equipment.
Many PC repairers with only a basic knowledge will attempt to repair a PC. They work the long and hard way by beginning to replace components on the PC until they resolve the problem.
But as Laptops are 90% electronic and are all built on the same board, hence they lack the knowledge, adequate education and the experience to diagnose and single out the Laptop faults.
We are most probably the only independent computer repairer in United Kingdom that are qualified electronic engineers and also have the correct testing facilities, within a static free environment in order to repair any electronic equipment, PC, Mac and Laptops
Virus Protection
Viruses cause problems. Nobody wants to get a virus, but many companies don’t feel the need to invest in virus software. Using our extensive knowledge, experience and proactive methods, we will protect your company.
FACTORS TO CONSIDER
Keep it current
Your virus software must be kept up to date. It should automatically connect to the Internet at least once a day and download the latest virus definitions. This will protect your computer from all known viruses.
Configuration
Make sure your virus software is configured to scan all incoming e-mails and to scan on demand. It must also be configured for heuristic scanning. This feature enables the virus software to detect possible unknown viruses based on the behaviour of a section of code in a file.
Schedule regular virus scans
Even if you are confident your system is protected, you should still schedule regular scans of your computer. You never know if a virus might have found a way in.
You can never be fully protected
Viruses are released every month. Hardly a month goes by when you do not hear about a virus attack on the news. If you receive a new, unknown virus, then the software may not detect it, even if ‘heuristic scanning’ is enabled. Remember this when you open attachments.
Training
Train your employees on how to spot a virus and what to do when they receive an e-mail attachment that looks unusual. Unknown viruses are a constant threat, so use training to improve your chances of not getting infected.
Wireless networks
Wireless networks are becoming more and more popular in the business world. They offer excellent advantages and benefits over traditional cabled systems.
SOLUTIONS
Wireless standards selection
There are a number of wireless standards currently in use. Each has its pros and cons. Finding the right balance for speed and range is important when deploying a wireless network. After all, you want the network to work for your business – not the other way round.
Quality equipment
Using quality components and manufacturers will mean fewer problems and more security. We use only wireless equipment compliant with Wi-Fi certification and approved for use by the Wireless Ethernet Compatibility Alliance (WECA).
Security
We can make your wireless network as secure as possible. There are a number of options available to enhance security.
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To arrange a callout, please telephone our freephone number.
Site Map
MJS provide a professional computer repair service and I.T Support service in the North East of England
- including the Newcastle, Morpeth and Northumberland area.
We have been trained to troubleshoot and fix both new and old computer systems and laptops, including
DELL, SONY, GATEWAY, E-MACHINES, HP, PACKARD BELL, FUJITSU, ACER and many other brand names with
Dos, Windows 3.1, Windows 95, Windows 98, Millennium, Windows 2000, XP and the new Vista operating system.
We respond to everything from installing a wireless modem and router to complete computer system upgrades.
If it's a desktop computer or laptop with a Microsoft Windows or Linux operating system - we repair, fix and maintain it!
Our service is aimed at both domestic and business users, who requires professional IT support at affordable prices.
MJS Computer Services offers a call-out service to your home or work place for computer support
to make it easier and more convenient to you.
Doesn`t it seem that your PC always needs to be repaired when you need it most ?
As well as providing an on site PC repair service and remote desktop support,
MJS also have many utilities which are available for immediate download from our PC TOOLS page
.
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