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Types of Hard Drive Failure and Data Recovery

Hard drive is the most important part of a computer system, which stores all your data, applications and operating system. Because it has moving internal parts, it may fail at any point of time and may result into critical data loss situations. Such situations can be taken care of by deploying Data Recovery procedures.

Hard drives can fail in four different ways:

* Damage to firmware zone/ firmware corruption

* Mechanical failure

* Electrical failure

* Logical damage

Whether the lost data and information on the drive is retrievable or not depends upon the extent of the damage and exact cause of the data loss situation.

Firmware Corruption

Firmware means software embedded on hardware. It lies in physical hard disk hardware. It is a program which controls the hard drive. When firmware corruption occurs, operating system can not interact with the drive and thus cause data loss. After repairing the firmware, your data can be easily recovered.

Mechanical Failure

Mechanical hard drive failure occurs due to damage to internal hard drive components such as read/write head, actuator arm, spindle motor, disk platters etc. When any internal component goes faulty, data from the hard drive can not be accessed. You can identify it by clicking and scrapping noise of hard drive internals.

Electrical Failure

Electrical failure generally relates to the issue with hard drive circuit board. Your computer system may face power failure that can damage the logic board on the drive making it undetectable in BIOS. When it occurs, the drive may not spin up when it is powered on. So, it cannot get recognized by the operating system.

Logical Damage

Logical damage takes place due to errors with the logical hard drive components. It may range from simple ones like an invalid file allocation table entry to the more complex ones like file system corruption. It is totally different from the above three hard drive failure types. It can be recognized by the inaccessibility of data, invisible hard drive partitions/volumes and error messages while accessing data.

All these data loss problems can be handled easily by using appropriate Hard Drive Recovery solution. In case of firmware corruption, electrical failure and mechanical failure, you are recommended to take service from recovery experts. On the other hand, logical data loss situations can easily be handled on your own using Data Recovery software.

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IDE Hard Drives Explained

Integrated Drive Electronics (IDE) interface in actual practice refers to ATA or AT Attachment. Any drive with a built-in controller is also called an IDE. Many IDE Hard Drives are plugged into a bus connector on the motherboard. These drives are easy to install and require the smallest number of cables because the controller is on the drive itself. No doubt ATA refers to its drive, but IDE on the other hand refers to the type of interface connector i.e. 40 pin in this case. ATA Packet interface or ATAPI is an extension of IDE which permit various devices like CD ROMs to work by using the IDE norms. Through this packet interface such devices are connected directly to an IDE port, but a device driver is needed to make full use of the device, meanwhile a hard drive is originally supported by IDE without the assistance of any drivers.

IDE Hard Drives can be found with most compatible computers, each computer is equipped with a maximum of four IDE devices. If you intend to buy IDE/ATAPI/ATA hard disk drive ensures there is available space for the drive to be connected. IDE hard drives are being used during the early Compaq 386 systems by way of WD controllers. During 1980s the ATA IDE was made as an ANSI standard, so a common design was created, but various areas were left open for different manufacturers for their own commands. Later two drives in the same system were considered as a hard nut to crack.

Because each drive has its own controller and both drives usually operate over the same bus. With the introduction of ATA, two drives were able to operate in a chain, thus, primary drive became the master and the secondary drive became the slave. IDE hard drives can be differentiated by a master or a slave with a jumper on the drive itself. While purchasing a second IDE Hard Drive you should stick with the same manufacturer to avoid unavoidable problems because of the compatibility issues involved. For example if you use Maxtor hard drive, choose a second hard drive from the same manufacturer. Sometimes, it could happen if you choose a different manufacturer’s IDE hard drive; it will not work on the same cable but will require a separate cables.

Apart from its interface, it is important to look for the transfer rate of the IDE hard drive. Long transfer rates means slower speeds of your computer while transferring larger files. While buying the IDE hard drive look for specifications like Rotations per Minute (RPM) i.e. 5,400 or 7,200 RPM. 7,200 RPM is ideal today.

Because of its older interface IDE hard drives generally carry a higher price tag like that of Seagate Barracuda 7200.10 1TB, this drive supports incredible space on a IDE interface. There are various manufacturers involved in making IDE Hard Drives like to name a few, Seagate, Hitachi, Western Digital, Toshiba and Iogear, they come in varying sizes ranging from 250GB to a whopping 2TB.

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Guide to Buying Internal Hard Drives

Apart from being one of the most essential parts of your computer, hard drive storage is constantly updating, in terms of both capacity of disk space and in physical size. When it comes time to upgrade your disk storage, there are a number of factors for you to take into account. Once you've made basic decisions about size, connectivity, speed and data transfer rate, and whether you want an internal drive or external, you can search through Myshopping.com.au to find the most suitable brand, and model, and compare the prices of different vendors.

Hard Drives

How A Hard Drive Works

Your hard drive has a number of magnetized platters connected to a spindle. The spindle spins the platters at a very fast speed while a series of read/write heads scan over them both looking for and writing information. This information is transferred via a cable system, or through a wireless connection to a hard disk controller, which in most systems is built into the motherboard, or in some systems installed as an add-in card. The information that comes from your hard drive through its controller is then made available to the components of your computer. The effectiveness of your hard drive (its performance) depends on how much of its capacity remains unused, how well organised the data is (known as fragmentation) and its data transfer rate, which in turn is dependent on its connection type and the drive's spin rate.

Internal Hard Drives

Most computers from, the most basic home models up to the most powerful servers, have an internally installed hard drive. Technology today ensures that they are all generally fast, reliable, and offer dependable storage ability. Most modern computers have installation slots and cabling to enable you to install additional hard drive. This allows you to increase your storage capacity without giving up your existing hard drive.

Internal Hard Drives

External Hard Drives

These drives are essentially the same drives as ones installed inside computers, but cased inside a protective, portable case. This is a good solution for people who work remotely and need to transport large amounts of data. If an external hard drive is your choice, make sure your computer is compatible with the interface that the hard drive uses. An add-in card, such as a FireWire card can help to increase your computer's capabilities. You can compare different brands of external hard drives simply at Myshopping.com.au and search on the connection type, or other specifications.

External Hard drives

Laptop Hard Drives

There have been many advances in miniaturization of hardware components for laptop computing, and hard drive technology is not left out of this loop. Laptop hard drives function in exactly the same way as internal hard drives on other computers, only they are designed to provide maximum storage and efficiency in the smallest possible package. For added flexibility, some laptop computers come with removable hard drives that can be easily installed and removed. However, before you buy a hard drive for your portable computer, check that the hard drive's specifications will meet the standards of your computer, as many laptop hard drives are proprietary, and are not compatible with other brands and models.

Laptop Hard Drives

Size

Your hard drive stores your operating system, its programs (games and applications), your working data, and your digital music and movies. Most new computer purchases have a minimum of 80 GB of hard disk space; many have considerably more. Hard drive space is one of those things, once you have it, you'll find ways to fill it soon enough. There is no real rule of thumb, but consider the cost per gigabyte of storage as a way to guide your purchase. If you work with large files, such as music, video and graphics, it pays to have a big storage space for your work. It may pay you to have two hard drives, one that houses all your programs and applications, and another for storing your work and projects.

You may want to compare the price of say a 160GB drive against two separate 80 GB drives. If one drive fails all is not lost. Today's hard drives however, are fairly robust pieces of equipment and providing they are not abuse, will serve you well for a long period of time.

up to 32 GB Hard Drives

32-64 GB Hard Drives

64-100 GB Hard Drives

100 GB and more Hard Drives

Interface

One key distinguishing factor between hard drives is the way in which they connect to your computer. There are a number of basic types of connection schemes used with hard drives. Each connection type has a range of differences in performance.

IDE (INTEGRATED DRIVE ELECTRONICS)

This is by the most common connection methods. Because the hard drive controller is on the drive itself rather than on the motherboard, it helps to keep costs down. There different IDE standards available. Mostly, you will want to purchase the fastest possible standard that your computer can support. Most computers will support a standard that is faster than what the computer currently supports, so you can buy a faster drive, and update your computer at a later time. The different IDE standards, in order from most basic to fastest, are:

ATA (Basic). Supports up to two hard drives and features a 16-bit interface, handling transfer speeds up to 8.3 MB per second.

ATA-2 or EIDE (Enhanced IDE). Supports transfer speeds up to 13.3 MB per second.

ATA-3. A minor upgrade to ATA-2 and offers transfer speeds up to 16.6 MB per second.

Ultra-ATA (Ultra-DMA, ATA-33 or DMA-33). Dramatic speed improvements, with transfer rates up to 33 MB per second.

ATA-66. A version of ATA that doubles transfer rates up to 66 MB per second.

ATA-100. An upgrade to the ATA standard supporting transfer rates up to 100 MB per second.

ATA-133. Found mostly in AMD-based systems (not supported by Intel), with transfer rates up to 133 MB per second.

IDE / EIDE Hard Drives

Serial ATA Hard Drives

Ultra DMA 100 Hard Drives

SCSI (SMALL COMPUTER SYSTEM INTERFACE)

This is the hard drive interface standard used by many high-end PCs, networks and servers, and Apple Macintosh computers, except for the earliest Macs and the newer iMacs. While some systems support SCSI controllers on their motherboards, most feature a SCSI controller add-in card. SCSI drives are usually faster and more reliable, and the SCSI interface supports the connection of many more drives than IDE. While SCSI drives come in many different standards, many of them are not compatible with one another. So it's important be know that your computer supports the drive you plan to install. The different SCSI connections are:

SCSI-1. A basic connection using a 25-pin connector, supporting transfer rates up to 4 MB per second.

SCSI-2. Uses a 50-pin connector and supports multiple devices with a transfer rate of 4MB per second.

Wide SCSI. These drives have a wider cable and a 68-pin connection that supports 16-bit data transfers.

Fast SCSI. Uses an 8-bit bus but transfers data at 10 MB Per second.

Fast Wide SCSI. Doubles both the bus (16-bit) and the data transfer rate (20 MB per second).

Ultra SCSI or Ultra Wide SCSI. Uses an 8-bit bus and transfers data at 20 MB per second.

SCSI-3. Features a 16-bit bus and transfers data at 40 MB per second.

Ultra2 SCSI. Uses an 8-bit bus and transfer data at a rate of 40 MB per second.

Wide Ultra2 SCSI. Uses a 16-bit bus and supports data transfer rates of 80 MB per second.

SCSI Hard Drives

Ultra320 SCSI Hard Drives

FIREWIRE (IEEE 1394)

The FireWire standard is becoming popular in portable hard drives because it can be connected and removed without having to reboot the computer. It supports data transfer rates of 50 MB per second, which means it is ideal for video, audio and multimedia applications. FireWire requires a dedicated add-in card and the hard drives in use require an external power source, but the interface can support up to 63 devices simultaneously.

FireWire Hard Drives

USB 1.1 (UNIVERSAL SERIAL BUS)

Pretty much all computers today include USB ports on their motherboards. (On older model, you can install an add-in card.) USB controllers can be used to connect external hard drives, and can support as many as 127 devices simultaneously either through USB port hubs or linked in a daisy chain fashion. USB controllers do delivery power to devices connected to them, but many hard drives still use an external power source. USB is limited by its data transfer speed, the maximum rate being about at 1.5 MB per second.

USB Hard Drives

USB 2.0 (HI-SPEED USB)

A more recently introduced and far better connection standard that offers backward compatibility and data transfer rates of up to 60 MB per second. USB 1.1 system can use a USB 2.0 device; it will need a USB 2.0 controller card to achieve the higher transfer rates.

USB 2.0 Hard Drives

FIBRE CHANNEL

Fibre Cabling is mainly used for high-bandwidth network servers and workstations, providing very fast data transfer rates (up to 106MB per second), and connection at long cabled distances, although it is expensive and you need to install a special interface card.

Spin rate

Data transfer rate is crucial to how well your computer performs for you. Apart from the connection types above, the performance of your hard drive depends on its spin rate, measured in RPM. Higher RPM generally means faster data transfer rate. The lowest spin speed that is acceptable in computing today is 5400 RPM. The common standard at present is 7200 RPM. But higher speeds are available in SCSI drives, and it is one area of computer system technology that is constantly being developed.

3600 RPM Hard Drives

4200 RPM Hard Drives

5400 RPM Hard Drives

7200 RPM Hard Drives

10000 RPM Hard Drives

15000 RPM Hard Drives

A larger capacity hard drive will not necessarily make your system function any faster unless you are low on available disk space with your existing drive. But a drive with Ultra ATA/100 or ATA/133 and a 7200-RPM spin rate will pretty much guarantee an improved hard drive performance.

Other considerations

CACHE

Cache (pronounces 'cash') is additional temporary memory that acts as a buffer between the system and the drive. Frequently accessed data is stored in the cache for quick access. Cache sizes vary from 512 KB up to 16 MB on some SCSI drives. The larger cache you have on your drive, the faster your drive will transfer data. If you are working with large files, such as video, images and audio files, it pays to have the largest cache you can get (8MB or more).

SEEK TIME

The data on your disk is stored in tracks and sectors and when you instruct your hard drive controller to retrieve some data, it goes looking. The seek time is a measure of how long it takes the hard drive to find a specific track on a disk. Seek times can vary slightly from disk to disk and a drive with a faster seek time will always perform better.

INTERNAL AND EXTERNAL TRANSFER RATES

These two rates tell how fast a drive actually reads the data and passes it along to the system. Internal Transfer Rate refers to the time it takes for a drives heads to read data from the platter and pass it to the drive's cache. The External Transfer Rate (sometimes called the Transfer Rate or the Burst Transfer Rate) is a measure of the time it takes to send the data from the cache all the way to the computer's memory. Naturally faster transfer rates provide better performance.

S.M.A.R.T. (Self-Monitoring Analysis and Reporting Technology)

This is a nice built-in feature in some hard drives that can help alert you to a potential hardware problem. Your computer's BIOS must support this in order for the SMART function it to work, however the drive itself will still work in a system without it.

Buying and installing a hard drive has some technical aspects that you need to take into account. Use Myshopping.com.au to compare different hard drive makes and specifications to find the drive that will work best for your needs and computer. You can compare prices and service offers from different vendors.

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