Hard Drive is commonly referred as a Hard Disk which is non-volatile storage device and is used to upgrade the already available storage capacity of the laptop or notepad. Notebook Hard Drive stores digitally encoded data on rapidly rotating platters with magnetic surfaces in a Notebook. Some of the examples of Hard Drives are floppy drives or floppy disks but they were detachable, one had to insert them to collect or enter the data, still there was one benefit using a floppy disk as the user was free to carry the data easily without some extra effort, but he could use that only on a computer if was able to find one.
They are not only used for some general purpose but also for some audio and video functions. Notebook hard drives are smaller in size with low capacity. For example mobile HDD spins at 5,400 rpm, with 7,200 rpm models available. They are smaller in size and mobile in nature but with low capacity compared to desktops.
In today's world there is a high demand for computers weather they may be computers, mobiles, desktops or laptops, which resulted in certain problems. Increasing data center machine density has led to problems delivering sufficient power to devices, and getting rid of the waste heat subsequently produced, as well as environmental and electrical cost concerns. Similar issues exist for large companies with thousands of desktop PCs. Smaller form factor drives often use less power than larger drives. One interesting development in this area is actively controlling the seek speed so that the head arrives at its destination only just in time to read the sector, rather than arriving as quickly as possible and then having to wait for the sector to come around.
The data is recorded by a magnetizing ferromagnetic material directionally and can be represented using binary codes between 0 or 1. They read the data back by detecting the magnetization of the material. An example of HDD design consists of a spindle which holds one or more flat circular disks called platters, onto which the data are recorded. These platters are made from a non-magnetic material, usually aluminum alloy or glass, and are coated with a thin layer of magnetic material. Hard drives were made of iron oxide as the magnetic material, but current disks use a cobalt-based alloy which is much more advanced.
The capacity of the hard drive is measurement by gigabyte or terabyte. Just by multiplying the number of cylinders by the number of heads by the number of sectors by the number of bytes/sector (most commonly 512) the capacity of the hard drive can be calculated. PrairieTek in 1988 first introduced the concept of sealed hard drives into laptops and mobiles. Before the era of PCs and small computers, hard disks were of widely varying dimensions, typically in free standing cabinets the size of washing machines. SATA, PATA & Micro ATA define the technologies used to connect the hard drive to notebooks.
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