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Computer Blog

Computer Blog
This blog provide information about computer. There will be many article submitted and people can comment and share their knowledge too.
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Articles

Word Recovery Software - Recover Your Word Data
2007-08-20 17:52:00
By Data Recovery The data that we store in our computer is the most important & valuable for us. Sometimes accidentally or purposely we delete our files and documents from our computer or it may be corrupted due to attack of viruses. Then we realize that you need the files back and have to recover it. Now you think how to recover these files?If your data is deleted from your computer, it’s really difficult to recover it. But in current times, there are many data recovery software available that not only recover your simple word, excel data but also recovers data from the Macintosh, UNIX, Linux, and Windows file systems.Once I had deleted a folder which had .doc files saved in it. I just hit the "Delete" button and the folder was gone and then emptied the "Recycle bin" too. After few days I realized the importance of those word files and regretted to delete them once for all from my system.After this I searched for word recovery software on internet and found word data recovery soft...
More About: Software , Word
The Need for Backup and Disaster Recovery
2007-08-20 17:44:00
By Stephen J. RichardsWhether a company relies heavily on database activity for critical everyday business operations or only for select requirements, the loss of data due to technological failure can have far reaching negative implications. The loss of valuable information and records can cause productivity setbacks, lost profits, lost customers and headaches for everyone involved. Aside from the obvious business challenges associated with the loss of data, legislation such as the Sarbanes-Oxley Act (SOX) places requirements on the retention and on request production of certain types of financial data. Companies assume the risk of non-compliance if they are unable to produce information within the specified time constraint required by Sarbanes-Oxley (SOX) or other information focused legislation. Database and mainframe disaster recovery is more important in today’s technology dependent business world than ever before.In the past, many businesses utilized offsite data tape storage...
More About: Backup , Recovery , Disaster , Aster , Disaster Recovery
Data Recovery Wizard Explained
2007-08-20 17:37:00
By jack robinsonData Recovery Wizard is designed as a one-stop data recovery solution. It will recover files that have been deleted by accident, recover lost files after its partition has been formatted and recover files after the attack of a virus or a computer crash. It can recover most any type of a file, including Word documents, Outlook messages, Excel spreadsheets, video, audio files, etc.Data Recovery Wizard is 4.59 Mb and dog simple to install. You download the installer from http://www.easeus.com/datarecoverywizard/ download/drwdemo.zip, unzip the archive and click the installer icon to start the installation. Basically what you see is a typical series of installation dialogs and the best thing is to click Next to do them all.Starting the program opens a user interface with 5 large buttons that looks like a roadmap with several ways to go depending on the problem you have. Each button starts a wizard that will get you around the recovery in a step-by-step fashion. The interf...
Data Recovery and Disaster Recovery Differ!
2007-08-20 17:29:00
By Ken Roberts|Data Recovery is not Disaster Recovery - contrary to popular belief. Ask somebody what data recovery is, and nine times out of ten the response is, "backup". Thinking the question is too vague, I set out to ask a better one: "What is the difference between disaster recovery and data recovery?"Technicians, you'll love this one...When speaking to a group of corporate executives - while attending the world's largest technology conference in Germany - I opened the discussion by asking them to define their data recovery strategy on a piece of paper in thirty seconds. Some of the answers were mind-boggling. The most popular one: "backup server". The most honest: "I don't know, our IT department handles that." And the most ridiculous: "We don't have this problem."The data recovery dog and pony show...One man came forward and said, "I've lost some data that I need to present at a talk tomorrow. Do you think you could help me out?". After listening to all the...I can't b...
More About: Data Recovery , Diff
What do you do if your RAID server fails?
2007-08-20 17:24:00
By shafa seoLet's face it. Life's full of ups and downs. It's full of uncertainties. Just like your precious data. If anything, data stability is not permanent. In fact, more often than not, data drives tend to crash and burn and leave you in the lurch when you least expect it.As we know, data is delicate and is subject to loss due to many reasons. The most common reasons for data drive failure are a virus, a poorly ventilated casing, actual component failure, damage to your hard drive, a hard disk crash or a power surge. It's highly possible that your data can be lost for any of these reasons. The best way to avoid getting hurt by data loss is to regularly back-up your data. You can schedule a fixed time for this every day or at fixed regular intervals. There is a lot of software out there that allows you to do this automatically. Make sure you backup data or else you will end up needing the services of a hard disk data recovery software or a company that specializes in HDD dat...
More About: Server , Raid , Serve
Disaster Recovery, Are You Prepared?
2007-08-20 17:21:00
Disaster recovery is one of the most important factors for most businesses, yet it is often overlooked or considered too expensive to implement. Disaster recovery solutions enable a business to continue working in the event of fire, theft, malfunction or terrorism. By preparing for disaster recovery, your business will not lose any valuable data, configurations or time, saving you money in the long run.By backing up data, applications, and settings continuously, to a secure location, your business will be ready for any disaster situation.Any proven IT company can provide these services, but at what cost, and how good is it?Since the introduction of Citrix and Microsoft's Terminal Services, it has been possible to provide these disaster recovery services at a much lower cost, with greatly enhanced security benefits.Switch your IT system to a corporate-level, Terminal Services environment and what you get is a complete disaster recovery solution for a much lower cost than you would e...
More About: Recovery , Disaster , Pare , Aster , Prep
RAID Data Recovery
2007-08-20 17:17:00
By shafa seoRedundant Array of Inexpensive (or Independent) Disks with the acronym "RAID", coined by a research group at UC-Berkeley, is a general term for data storage that combine an array of drives collectively to act as a single logical unit. They provide increased data reliability and/or throughput depending on the option or scheme. It is disk subsystem where a set of two or more drives (or discs) with a specialized disk controller contains the RAID operating function. The use of RAID can enhance performance and/ or is endowed with error tolerance.RAID was developed basically for servers and stand-alone disk storage systems, but can be used on workstations like the desktop PCs. Desktop PC can have RAID added to its system by installing a RAID controller board and additional IDE or SCSI disks. More and more RAID functionality are being built on the motherboard.Most Small to medium enterprises have gone in for RAID-configured data storage on their servers. RAID even though is ver...
More About: Recovery , Data , Data Recovery , Raid
Importance of Data Recovery
2007-08-20 17:09:00
Know the importance of data recovery software and data recovery services when you face the situations of data loss and its inaccessibility. The number of data recovery software present in the market enables you to retrieve your lost data and the data recovery services prove helpful in recovery of data in cases of major corruptions to your storage media.What happens when you are working on a special project or document and your computer system displays a blank screen? Or one of the partitions is not recognized by the BIOS - It could be anything.So is this a warning from your computer about some mis-happening about to happen such as hard disk failure, system crash or some other problem that caused your system to shut down? Don’t be surprised! This could lead your computer system to become dead and all your valuable data is gone forever. But Stop, Don’t Panic, the relief is there.“The data which appears to be lost and inaccessible, in real terms is not lost forever. The lost data...
More About: Recovery , Data , Data Recovery
What is Data Recovery? - A brief Introduction
2007-08-20 16:46:00
Data Recovery is the process of retrieval of inaccessible or corrupt data from digital media that has become damaged in some way. Data Recovery can be used to recover data from devices as varied as Hard Disk Drives, Memory Cards, Tapes, Mobile Phones, Personal Digital Assistants, Floppy Disk’s, CD’s, DVD’s, Data Cartridges, Xbox’s and many more items.Data Recovery may be needed for reasons as diverse as hardware failure, (the tape has been ‘chewed’ up, the hard disk drive has failed, the user has maliciously damaged the computer or digital device, or it could have suffered fire or flood damage). All of these instances will require the services of a professional data recovery company if the data was of such value (be it sentimental or financial) that the cost of the services are less than the perceived value of the data which is no longer accessible.It is not just businesses who are at risk from Data loss. Clients requiring data recovery come from all walks of life, inclu...
More About: Data , Introduction , Brief
What is data recovery?
2007-08-20 14:59:00
Data recovery is the retrieval of inaccessible or contaminated data from media that has been damaged in some way. Data recovery is being increasingly used and is an important process nowadays.There has been a lot of progress in increasing the memory capacity of data storage devices. Therefore data loss from any one incident also tends to be very high. The relevance of lost data can vary greatly. Maybe you have had the experience of storing a homework assignment on a floppy disk only to have it missing on the day the assignment in due.Consider the fact that a large amount of businesses nowadays have vital organizational related data stored on machines. Also hospitals store data on patients on computers. Large amounts of websites nowadays use databases technology to enhance their websites and make them more dynamic. Php and MySql use has been on the rise on the Internet. Database failure is not uncommon and so it is not a fail proof method of storing information.Companies have high re...
More About: Recovery , Data , Data Recovery
Encryption
2007-03-12 13:04:00
NTFS support encryption where it keeps file or folder safe from intruders who are unauthorized to access them. When a file or folder encrypted by NTFS, it cannot be access by unauthorized user where there receive error message if they try to open, copy, move, delete or rename the encrypted file or folder. When file encrypted, it is actually transparent for authorized user and any applications. If authorized users access the encrypted file or folder, it will be decrypted automatically without interaction with the user. After the file or folder saved, NTFS re encrypted the file. Indeed, all encryption / decryption process are occur automatically as long as you mark the file or folder as encrypted. Technorati : Encryption Del.icio.us : Encryption
More About: Crypt
NTFS Compression
2007-03-09 06:55:00
Compression is to decrease the object size and reduces the amount of allocated space in the volume to stores the object. NTFS support compression on a file, folder and even the NTFS volume itself. Unfortunately, NTFS only support compression for cluster that not greater than 4KB only. Compression is not available for NTFS volume that uses cluster that more than 4KB.NTFS does not need other compressed/decompressed program such as WinZip or winrar to read or written the compressed file in NTFS. User can open a compress file without need to decompressing them first. The decompression of the file is done by NTFS automatically and copies it into memory. If user closed or saved the file, NTFS automatically compressed the file back and stored in the volume. In other word, compression and decompression was done automatically by NTFS itself without user's interference. Unfortunately, this caused NTFS performance decrease because NTFS need to perform the compression or decompression before o...
More About: Compression , Press , Comp , Sion , Compress
NTFS Features
2007-03-06 05:10:00
Compare with the previous file system, NTFS provides more features that improve the security, space efficiency, reliability and data integrity of the disk volume. NTFS new features made it is suitable to in a network environment. As network becomes bigger and more users are connected, more security and data efficiency must be provided. Among the features of NTFS that will be discussed are:NTFS Compression featuresIt is a file-based compression that allows a file or folder to be compressed (reduce space needed to store file) and can be read and written by any windows-based application. This compression is handled by the operating system itself.NTFS EncryptionNTFS can automatically encrypt and decrypt the file data to provide an additional level of security for files and directories.NTFS Object PermissionNTFS enable user to set permission on file or folder for security purpose. This features used to control the access level for particular user or group to file or folder. Permission ca...
More About: Features , Feature , Feat
NTFS Architecture
2007-03-05 05:07:00
When you press a start button on a computer, system BIOS started and search for first boot device. This first boot device can be set by user by entering the BIOS setup. Normally, the first boot device is a hard disk. As mention in previous topic, a formatted hard disk contains a Master Boot Record (MBR). A master boot record contains "master boot code" and partition table for the hard disk. When MBR is loaded, master boot codes are executed and search for partition table to find which partition is active or bootable. After detect an active partition, a boot sector that located at the first logical sector of the active partition, loaded in memory. This boot sector contains an executable code and data that required by the code, to determines the disk structure before loading an operating system.When an executable codes within a boot sector are executed, it provides information to locate the NTLDR. NTLDR consist of ntldr.dll file which switches the CPU to protected mode and start the f...
More About: Architecture , Archi , Architect
NTFS Components (Cont2)
2007-03-04 10:39:00
D) File System Data / Area NTFS view every each of file and folder in the volume as the file attribute . This file attribute including file name, security information and also the data. Each of file attributes are identifies by an attribute type code and optional attribute name . As mention earlier, each file or folder exist in NTFS volume recorded on Mft as file or folder records. What actually is this file and folder records? It is the file attribute for each file as well as the partition of that file record within the Mft. Unfortunately, not all of file attribute can fit within Mft. If the file attribute can fit within the Mft, it is called resident attributes. For instance, file attribute such as file name and time stamp always be resident attribute. On the other hand, if the file attributes does not fit the Mft, it is called non-resident attributes. Non-resident attributes stores a portion of the file attribute within Mft and the remaining are stores in other cluster outside th...
More About: Comp , Components , Component
NTFS Component (Cont)
2007-03-03 09:32:00
B) Master File Table Every file that exists in NTFS volume must be recorded in Master File Table (MFT). MFT consist of 16 records that describe MFT itself (metadata) , MFT minor record , log file and or folder records for each file or folder exists in NTFS volume. Figure 5 illustrated MFT metadata files stores in MFT. System File File Name MFT Record Description Master file table $Mft 0 Allocates at least one file record for each file or folder here. If the file or folder is too large to fit within a single record, other file records are allocated too. Master file table copy $MftMirr 1 This is a duplicate copy of first four records of the MFT as a backup if failure happened in MFT. Log file $LogFile 2 Contain information that can restore metadata consistency after a system failure. Volume $Volume 3 Contain information about volume Attribute definitions $AttrDef 4 Contain information about attribute name, numbers, and description. Root file name index . 5 The root folder Cluster bitm...
More About: Comp , Component
NTFS Components
2007-03-02 14:18:00
A) Partition Boot Sector When a hard disk is formatted, a Master Boot Code (MBR) is created. MBR contain executable code called “Master boot code” that will be loaded into memory by system BIOS. This code scans the partition table that consists in MBR as well to find which partition is active . After find the active partition or bootable partition in boot sector, it is load to memory . Figure 4 illustrated boot sector section on NTFS Volume. Byte OffsetField LengthField Name0x003 bytesJump Instruction0x038 bytesOEM ID0x0B25 bytesBPB0x2448 bytesBPB Extended0x5442 bytesBootstrap code0x01FE2 bytesEnd of sector markerBPB & Extended BPB Comp onentsByte offset Field Length Field Name 0x0B 2 bytes Bytes Per Sector0x0D 1 byte Sector Per Cluster 0x0E 2 bytes Reserved Cluster 0x10 3 bytes Must be 0 0x13 2 bytes Must be 0 0x15 1 byte BPB Media Descriptor 0x16 2 bytes Must be 0 0x18 2 bytes Not used by NTFS 0x1A 2 bytes Not used by NTFS 0x1C 4 bytes Not used by NTFS 0x20 4 bytes Must be 0 0x...
More About: Components , Component
NTFS Physical Structure
2007-03-01 03:23:00
When a hard disk is formatted, a Master Boot record (MBR) is created. MBR consist of executable code called Master Boot Code and Partition Table information of the disk.NTFS cluster size is depending on the size of the volume. However, when formatting NTFS volume, you can specify the cluster size up to 64Kb. If you did not specify the cluster size, default cluster size is used. Figure 3 illustrated the cluster size base on volume size.Volume SizeCluster Size7MB – 512MB512512MB – 1024MB1KB1025MB – 2GB2KB2GB – 2TB4KBFigure 3 Cluster size for each volume size.NTFS disk space efficiency actually determine by the cluster size of NTFS volume because it uses smaller cluster size than FAT file system. The smaller the cluster size, the more efficient the disk is because unused space in cluster that have been used cannot be use to store file. NTFS also support more clusters which is nearly unlimited and it able to create larder volume up to 2Tb.When a hard disk is formatted with NTFS ...
More About: Physical , Structure
NTFS
2007-02-28 11:52:00
New Technology File System (NTFS) is a file system managing file that exists in the hard disk (NTFS Volume). It can be called disk file structure which used Master File Table (MFT) instead of File Allocation Table (FAT). This file system is more advanced than FAT file system which provides more efficiency in performance, security, data efficiency and data recovery.NTFS file system managed each file in NTFS volume using structuring method. Every file that store in NTFS volume recorded in Master File Table (MFT) whereas MFT is a relational database that consist of file records for each of particular file that exist in NTFS volume with its file attribute as well. On the other hand, FAT file system which uses File Allocation Table, record every each of particular file that exists in FAT volume by the file names and its addresses.Before you read this article, the first thing that you should know is what is Cluster and Sector on an NTFS volume (hard disk). Below is illustrated of Cluster ...
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