This type of harddisk are used by big organization to store massive amount of data.Useful to protect or secure information and also to backup of the pc.Used as alternative to internal harddisk.Amount of storage is limited to number of cartridges.These are easy to remove as like CD from CD drive.Problem such as they can't be removed from the system cabinet easily.To solve problems of internal hard disk, hard disk cartridges came into existence.Can perform faster operations and has fixed amount of storage.Its capacities is measured in bytes with common capacities stated as GB or TB.Hard disk comes with different storage capacities.Hard disk spins between 3600 to 12,000 rpm.It also contains access arm and read/write heads for reading/writing the data.Container includes a motor for rotating disk.Consists of one or more metallic plates sealed inside a container.Used to store programs and large data files.It is located inside the system case (cabinet).Similarly to write a data on platter, head is moved to particular magnetic domain where the write head transforms electric current into magnetic field which changes the magnetic polarization to induce either 0 or 1 value.To read a data from the platter, head is moved to a particular magnetic domain where the read head transforms magnetic field into electric current using the property of magnetoresistance.In read/write head, read head element is made up magnetoresistive and write head element is made up of thin-film inductive.Magnetic surface of each platter is divided into very small magnetic regions called as magnetic domains, which stores the value 0 or 1.Consists of rigid one or more rotating platters coated with magnetic surface, read/write head per platter face to examine the data, spindle on which the platters spins at constant rotational velocity, acutator arm that moves across the platter, IDE connector, power connector, two motors one to spin the disks and other to position the head and a sealed enclosure that protects from dust, condensation etc.
Cost of drive is less compare to volatile storage devices like RAM.Seek time: it is amount of time when cpu request a file and time when cpu gets the first byte of the file, varies from 10 - 20 milliseconds.Data rate: it is number of bytes transferred per second to the cpu, varies from 5 - 40 MBPS.
Hard disk drive diagram serial#
Modern hard disk uses serial interface like Serial ATA (SATA), Serial Attached SATA (SAS) etc.Standard size is 3.5 inch for desktops and 2.5 inch for laptops.
Get the cylinder, head and sector value of the hard disk by using DiskGenius 1.Start DiskGenius and on the Partition and Folder Tree of the main interface select the hard disk.Ģ.On the right part of the main interface, you can see cylinder, head and sector value.ģ.Besides, you can see the total sector number of the hard disk and the size of one sector.A non-volatile storage device used to store digital data on magnetic surface of rigid plate by using read/write heads. Since we have gotten a glimpse of the physical structure of the hard disk, in the next article we'll learn something about partition table. The head will determine the disc position and side after which you can locate the sector you want. You are wrong if you indicate a disc first you should indicate a cylinder first and then indicate the head.
Hard disk drive diagram how to#
Since the sector is the minimal storage unit of the hard disk, so the above question becomes how to locate a sector on a hard drive. Normally, a disc has two heads for reading or writing data, one is for the top and the other one is for the opposite side the head value means the disc location and side.Ī track is composed of sectors and the number of sectors of all tracks on the hard disk is the same.Sector is the minimal storage unit of a hard disk the size of one sector is always 512 bytes (rarely, it might be 1024, 2048 or 4096 bytes in some special hard disks). The disc that makes up the hard disk is divided into tracks tracks of all discs which have same track value are called a cylinder, so the cylinder is a pile of tracks with same track value of a hard disk. How to locate a position on a hard disk? There are three words you should learn: cylinder, head and sector. The above picture is the physical structure of a hard disk the hard disk consists of several discs. If you want to know what the partition table is, you should learn the physical structure of the hard disk first. Physical structure of a hard disk - Master partition table step by Part 1