The hard disk is the main storage device in your computer. It is a bit like a filing cabinet: all of your data files and applications software are stored on it. The hard disk contains a number of metal platters which have been coated with a special magnetic material. The data is stored in this magnetic material. Thus‚ the hard disk is known as a magnetic storage device. In order to access the data‚ the platters spin many thousands of times a second and a magnetic read and write head floats just
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HARD DISK DRIVES •Performance •Storage capacity •Software support •Reliability Why we call it as……. • Hard disk • Fixed disk • Winchester disk Hard Disk Drive Components • • • • • • • • Disk platter Read/Write head Head arm/Head slider Head actuator mechanism Spindle motor Logic board Air filter Cables & Connectors • Disk platter • The data’s are stored in this media • Form factor 9 5.5” - actual size is 5.12” 9 3.5” - actual size is 3.74” 9 9 9 9 2.5” 1 1/8” 1 1/3” 1” • The 5.25” platter
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Uses Advantages Disadvantages Magnetic backing storage media Stores the binary data on a disk or tape coated with a material that can be magnetised differently‚ depending on whether a 0 or 1 is stored. used for tertiary and off-line storage. Data stored in backing storage is permanent so it is NOT lost when the computer is turned off. It is always slower to access data from backing storage than from internal memory. Fixed hard disks A hard-drive built into the case of the computer is known
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STORAGE DEVICE Definition A storage device can be defined as any piece of hardware whose main function is to store data and information The hardware that writes data to or reads data from a storage medium is called a storage device. Types of Computer Storage Devices Computer storage devices can be classified into o Primary storage o Secondary storage o Tertiary storage Primary Computer Storage Devices Primary storage refers to the computer’s memory(RAM) RAM (Random Access Memory)
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Types of Storage Devices Physical components or materials on which data is stored are called storage media. Hardware components that read/write to storage media are called storage devices. Two main categories of storage technology used today are magnetic storage and optical storage. Primary magnetic storage o Diskettes o Hard disks (both fixed and removable) o High capacity floppy disks o Disk cartridges o Magnetic tape Primary optical storage o Compact Disk Read Only Memory (CD ROM)
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Video 1.06 Storage Devices Hard Drives Hard drives are comprised of platters Read/Write heads for each platter Read and write on top and bottom of platter Never exposed to magnets Data loss may occur 137 GB Limit Hard Drive size limited to 137GB Not a physical limit Limited by address the system can support 28 bit communications limited to 268‚435‚555 addresses equates to 137 GB Flash BIOS to upgrade hard drive interfaces PATA‚ SATA‚ SCSI‚ USB‚ and FireWire most common is the
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Types of Storage Devices A storage device is a device capable of storing data. The term usually refers to mass storage devices‚ such as disk and tape drives (www.webopedia.com). In this paper I will explore different types of storage devices and which ones are optimal for different situations. I will also explain what situations are appropriate for the following devices and explain why: a. Hard disk b. Floppy disk c. RAM d. CD ROM e. Tape Hard Disk A hard disk is a magnetic disk on which
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Random Access Transport Capacity Abstract This project develop a new metric for quantifying end-to end throughput in Multi hop wireless networks‚ which we term random access transport capacity‚ since the interference model presumes uncoordinated transmissions. The metric quantifies the average maximum rate of successful end-to-end transmissions‚ multiplied by the communication distance‚ and normalized by the network area. We show that a simple
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define at least five different types of storage devices from the most reliable to the least reliable. Include in your search cost and availability of the storage devices. Include names of vendors for these storage devices. There are three main types of consumer-grade computer storage: internal‚ external‚ and network attached. Internal storage is generally a hard drive or solid-state drive (SSD) that hosts computer’s operating systems and programs. External storage comes mostly in the form of external
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Limitations of Primary Memory: Limited capacity because the cost per bit of storage is high Volatile - data stored in it is lost when the electric power is turned off or interrupted. So as a result additional memory called auxiliary memory or secondary memory is used. Following are the features of Auxiliary or Secondary Storage: 1. Permanent or Non-volatile Storage: The data which is stored in those devices is not lost when the power is switched off. The data is retained. 2. Voluminous
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