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It may not hold the bits past 10 or 20 years. Nobody knows for sure Persistent storage - long term storage for bytes as files and folders. Persistent means that the bytes are stored, even when power is removed. A laptop might use a spinning hard drive also known as "hard disk" for persistent storage of files. The hard drive reads and writes magnetic patterns on a spinning metal disk to store the bytes, while flash is "solid state": no moving parts, just silicon chips with tiny groups of electrons to store the bytes.
In either case, the storage is persistent, in that it maintains its state even when the power is off. A flash drive is faster and uses less power than a hard disk. However, per byte, flash is significantly more expensive than hard drive storage.
Flash has been getting cheaper, so it may take over niches at the expense of hard drives. Note that Adobe Flash is an unrelated concept; it is a proprietary media format. Flash storage is what underlies USB thumb drives, SD cards for use in cameras, or the built-in storage in a tablet or phone. File System How are the bytes in persistent storage organized? Bytes on a flash drive?
Typically the hard disk or flash disk is formatted with a "file system" which organizes the bytes into the familiar pattern of files and directories, where each file and directory has a somewhat useful name like "resume. When you connect the drive to a computer, the computer presents the drive's file system to the user, allowing them open files, move file around, etc. Essentially, each file in the file system refers to a block of bytes, so the "flowers.
The file system in effect gives the user a name and probably an icon for a block of data bytes, and allows the user to perform operations on that data, like move it or copy it or open it with a program.
The file system also tracks information about the bytes: how many there are, the time they were last modified. Jitendra Singh Rauthan.
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Srdjan Velickovic. Volatile means that the data stored in memory is lost when we switch off the computer or if there is a power failure. There are different types of RAM available. Some of them are described below. The term dynamic indicates that the memory must be constantly refreshed or it loses its contents.
This type of memory is more economical. The term static is derived from the fact that it does not need to be refreshed like DRAM. This type of memory is non-volatile. The information is stored permanently in such memories during manufacture.
A ROM, stores such instructions that are required to start a computer. This operation is referred to as bootstrap. The different types of ROM are given below. The MROM cannot be programmed by the user.
EPROM is erased by exposing it to ultra-violet light for a duration of up to 40 minutes. It can be erased and reprogrammed about ten thousand times.
Both erasing and programming take about 4 to 10 milliseconds. Secondary Storage External Storage Devices Floppy diskettes, hard disk, tapes and optical disks come under the category of external storage devices or ancillary storage devices. These devices are very sensitive to environmental conditions humidity and temperature as well as to external magnetic fields and need to be stored carefully.
Information on a floppy disk is recorded in the magnetized states of particles of iron oxides evenly placed upon concentric circles known as tracks. It contains a stack of metal platters, each coated with iron oxide, that spin on a spindle and the entire unit is encased in a sealed chamber.
C Magnetic Tape This is plastic tape, usually made of Mylar that is coated with iron oxide, thereby enabling the introduction writing ; retention memory and reading of magnetically recorded information. The best use of tape storage is for data that you do not use very often. If a peripheral device is disconnected, the computer will still be able to work; only functions performed by this peripheral device will not be available.
Here are the most used types of peripheral devices: A Keyboard The most common and very popular input device which helps in inputting data to the computer.
It consists of keys that are capable of inputting alphabets, numbers and special characters.