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solid state drives
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∙ 14y ago
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What are hard drives without spindle and platterscalled?
Solid-State Drives (SSD's)?
Do solid state drives have platters or motors?
No
What kind of drives consist of a sealed case containing platters or disks that rotate at a high speed?
hard
What uses the same kind of memory that flash drives use and have no spinning platters or motors?
SSD
What uses the same kind of memory that flash drives use and has no spinning platters of motors?
SSD
Which type of motor is not used in axis or spindle drives of cnc machine tools?
Stepper motor
What is the best way dispose of old laptops that have your info on the hard drives?
There is software that will overwrite data on the hard drive. Personally, I would dismantle the laptop, remove the drives, strip the drives and smash the platters. There is little value in selling old computers.
What are the components of hard disk?
Most of the enclosure is made out of a metallic alloy however the main part of a hard drive, which stores the data magnetically, is called the platter. In a hard drive there are normally several platters. Platters can store data on both sides requiring a head (reader) for each side. The core of the platters are typically made using an aluminum or glass and ceramic substrate shaped into a disk. Then the disk is coated with a thin layer of a mostly nonmagnetic metallic alloy and on top of this is a protective carbon-based overcoat. Both of these layers are applied in the same process which is called sputtering. The next layer of the disk is a nanometer thin polymeric lubricant applied by dipping the disk into a solvent solution. The surface of the disk needs to be flawlessly smooth so that the disk head can rapidly move over the surface. Scott
What is the differences between magnetic hard drives and solid state hard drive?
Traditional magnetic hard drives use platters that spin and a magnetic head that applies negative and positive charges to the platters to record data in 1s and 0s. SSD drives are essentially flash drives similar to what is used in iPods. "Switches" in each memory "bank" are turned on and off with an electrical signal to record the data in 1s and 0s. SSD is faster because it does not have to "seek" for the location of the data on the hard drive.
What are the disadvantages of hard drives?
Hard drives have movable parts as result their life time is limited be durability of metals and alloys which are used for the production. The ferromagnetic films on platters have limited lifetime too. And eventually start to decay.
HDD spindle motor is a stepper motor?
Sort of. More importantly, steppers and spindle drives are both examples of synchonous AC motors with a magnetised rotor and AC-excited stator windings.
How does data get stored in hard disk and CD and what is the role of magnetism in the storage process?
HDDs record data by magnetizing ferromagnetic material directionally, to represent either a 0 or a 1 binary digit. They read the data back by detecting the magnetization of the material. A typical HDD design consists of a spindle which holds one or more flat circular disks called platters, onto which the data is recorded. The platters are made from a non-magnetic material, usually aluminum alloy or glass, and are coated with a thin layer of magnetic material. Older disks used iron(III) oxide as the magnetic material, but current disks use a cobalt-based alloy. The platters are spun at very high speeds (details follow). Information is written to a platter as it rotates past devices called read-and-write heads that operate very close (tens of nanometers in new drives) over the magnetic surface. The read-and-write head is used to detect and modify the magnetization of the material immediately under it. There is one head for each magnetic platter surface on the spindle, mounted on a common arm. An actuator arm (or access arm) moves the heads on an arc (roughly radially) across the platters as they spin, allowing each head to access almost the entire surface of the platter as it spins. The arm is moved using a voice coil actuator or (in older designs) a stepper motor. Stepper motors were outside the head-disk chamber, and preceded voice-coil drives. The latter, for a while, had a structure similar to that of a loudspeaker; the coil and heads moved in a straight line, along a radius of the platters. The present-day structure differs in several respects from that of the earlier voice-coil drives, but the same interaction between the coil and magnetic field still applies, and the term is still used.
