isotropic disk - tradução para árabe
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  1. Dicionários
  2. Dicionário inglês-árabe
  3. isotropic disk

isotropic disk - tradução para árabe

THEORETICAL POINT SOURCE WHICH RADIATES ELECTROMAGNETIC OR SOUND WAVES AT THE SAME INTENSITY IN ALL DIRECTIONS
Isotropic antenna; Isotropic antennas
  • Diagram of antenna and resistor in cavity
  • Animated diagram of waves from an isotropic radiator ''(red dot)''. As they travel away from the source, the waves decrease in amplitude by the inverse of distance <math>1/r</math> and in power by the inverse square of distance <math>1/r^2</math>, shown by the declining contrast of the wavefronts. This diagram only shows the waves in one plane through the source; an isotropic source actually radiates in all three dimensions.
  • A depiction of an isotropic radiator of sound, published in ''[[Popular Science Monthly]]'' in 1878. Note how the rings are even and of the same width all the way around each circle, though they fade as they move away from the source.

isotropic disk      
‎ قُرْصٌ إِسْوِيُّ المَحَاوِرِ,الشَّريط I‎
disk platter         
CIRCULAR DISK ON WHICH MAGNETIC DATA IS STORED IN A HARD DISK DRIVE
Hard disk platters; Disk platter; Drive platter; Hard drive platter; Hard disk platter; Hard-disk platter
طبق قرص
external hard disk         
  • 2.5-inch SATA drive on top of 3.5-inch SATA drive, showing close-up of (7-pin) data and (15-pin) power connectors
  • A newer 2.5-inch (63.5&nbsp;mm) 6,495&nbsp;MB HDD compared to an older 5.25-inch full-height 110&nbsp;MB HDD
  • Recording of single magnetisations of bits on a 200&nbsp;MB HDD-platter (recording made visible using CMOS-MagView).<ref name="AutoMK-9" />
  • Diagram of HDD manufacturer consolidation
  • access-date= December 1, 2019 }}</ref>
  • read-write head]], showing the side facing the platter
  • Video of modern HDD operation (cover removed)
  • A disassembled and labeled 1997 HDD lying atop a mirror
  • An HDD with disks and motor hub removed, exposing copper-colored stator coils surrounding a bearing in the center of the spindle motor. The orange stripe along the side of the arm is a thin printed-circuit cable, the spindle bearing is in the center and the actuator is in the upper left.
  • Close-up of an HDD head resting on a disk platter; its mirror reflection is visible on the platter surface. Unless the head is on a landing zone, the heads touching the platters while in operation can be catastrophic.
  • Diagram labeling the major components of a computer HDD
  • An overview of how HDDs work
  • Hot-swappable]] HDD enclosure
  • Head stack with an actuator coil on the left and read/write heads on the right
  • Internals of a 2.5-inch laptop hard disk drive
  • Longitudinal recording (standard) & [[perpendicular recording]] diagram
  • 2022}}, Seagate offers capacities up to 20TB.
  • Seagate]] HDD that used the [[Parallel ATA]] interface
  • 8-, 5.25-, 3.5-, 2.5-, 1.8- and 1-inch HDDs, together with a ruler to show the size of platters and read-write heads
  • Destroyed hard disk, glass platter visible
  • Two high-end consumer SATA 2.5-inch 10,000&nbsp;rpm HDDs, factory-mounted in 3.5-inch adapter frames
  • Two 2.5" external USB hard drives
DATA STORAGE DEVICE
Hard drive; Hard disk drive functioning; Hard-disk; Harddisk; Hard disc; Harddisc; Hard Disk; Hard disks; Hard drives; Hard disc drive; Harddrive; Hard disk drives; Fixed disk; Pocket hard drive; Hard Drives; External hard drive; Hard file; External hard disk; Disk Overhead; External Hard Drive; External HDD; Laptop hard drive; Access arm; Actuator arm; External Hard Drives; Hard disk interfaces; Hard Disks; Hard Disk Drive; PC hard disks; Hard disk; Travel drive; The binary effect; USB hard disk; 2.5 inch hard drive; Usb hard disk; Enterprise disk drive; Hard disk parameters; Hard drive capacity; Fixed disk drive; External hard disk drive; Fixed drive; HDD Thermometer; ExternalHDD; Femto Slider; Spindle (computer); External volumes; Portable hard drives; Portable hard disk; Portable hard disk drive; External hard drives; Disk structure; Internal hard drive; Hard-disk drive; Hard disk drive spindle; Disk drive spindle; Portable hard drive; Hard disk drive actuator; Spindle (hard disk drive); Hard disk error rates and handling; Disk subsystem; Portable drive; External removable drive; External removable hard disk drive; External portable hard disk drive; External portable drive; USB hard disk drive; Portable USB hard disk; Portable USB hard disk drive; HDD form factor; Rigid disk drive; Hard-Drive; PowerChoice; Hard disk driver; Magnetic disk memory; Hard disk drive error rates and handling; 🖴; Magnetic hard drive; Rotating iron; Rotating rust; Hard disk drive form factor; Hard disk storage; Rotational media
قرص صلب خارجى .

Definição

disk drive
<hardware, storage> (Or "hard disk drive", "hard drive", "floppy disk drive", "floppy drive") A peripheral device that reads and writes hard disks or floppy disks. The drive contains a motor to rotate the disk at a constant rate and one or more read/write heads which are positioned over the desired track by a servo mechanism. It also contains the electronics to amplify the signals from the heads to normal digital logic levels and vice versa. In order for a disk drive to start to read or write a given location a read/write head must be positioned radially over the right track and rotationally over the start of the right sector. Radial motion is known as "seeking" and it is this which causes most of the intermittent noise heard during disk activity. There is usually one head for each disk surface and all heads move together. The set of locations which are accessible with the heads in a given radial position are known as a "cylinder". The "seek time" is the time taken to seek to a different cylinder. The disk is constantly rotating (except for some floppy disk drives where the motor is switched off between accesses to reduce wear and power consumption) so positioning the heads over the right sector is simply a matter of waiting until it arrives under the head. With a single set of heads this "rotational latency" will be on average half a revolution but some big drives have multiple sets of heads spaced at equal angles around the disk. If seeking and rotation are independent, access time is seek time + rotational latency. When accessing multiple tracks sequentially, data is sometimes arranged so that by the time the seek from one track to the next has finished, the disk has rotated just enough to begin accessing the next track. See also sector interleave. The disks may be removable disks; floppy disks always are, removable hard disks were common on mainframes and minicomputers but less so on microcomputers until the mid 1990s(?) with products like the Zip Drive. A CD-ROM drive is not usually referred to as a disk drive. Two common interfaces for disk drives (and other devices) are SCSI and IDE. ST-506 used to be common in microcomputers (in the 1980s?). (1997-04-15)
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Wikipédia

Isotropic radiator

An isotropic radiator is a theoretical point source of electromagnetic or sound waves which radiates the same intensity of radiation in all directions. It has no preferred direction of radiation. It radiates uniformly in all directions over a sphere centred on the source. Isotropic radiators are used as reference radiators with which other sources are compared, for example in determining the gain of antennas. A coherent isotropic radiator of electromagnetic waves is theoretically impossible, but incoherent radiators can be built. An isotropic sound radiator is possible because sound is a longitudinal wave.

The unrelated term isotropic radiation refers to radiation which has the same intensity in all directions, thus an isotropic radiator does not radiate isotropic radiation.

https://en.wikipedia.org/wiki/Isotropic radiator
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