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Physical principles of magnetic recording

The recording of 'information on the surface of the support ferromagnetic basically consists in the transfer of a particular towards the magnetization of a number of Weiss domains.
The number of Weiss domains that constitute a single bit multiplied by the extension mean surface area compared to the available storage, provide the density d 'information (bits per square inch). So
cram a larger amount of data on the same disc requires a reduction in the number of domains that define a single bit and / or reduction of the 'area of \u200b\u200ba single magnetic domain.
's continuing development of hard drive technology has brought us close to the lower limit now tolerable: when in fact the number of domains that define a single bit has been approached to 'unity and their area of' order of a few square nanometers, the 'thermal energy system has become comparable to the' magnetic energy and just a short time have to reverse the direction of magnetization of the domain (this is a fluctuation) and losing in this way the 'information contained.

Reading of 'information in the past was carried out by magnetic inductive heads, miniature copper coils that can detect the change in the flow of the static magnetic field to pass the head between a bit and the next secondo il principio di induzione magnetica.
L’ evoluzione che la spintronica ha portato nelle case di tutti sono state le testine magnetoresistive, basate su un dispositivo, la spin-valve, in grado di variare resistenza al mutare dell’ intensità del campo magnetico.
Il vantaggio dato da queste testine risiede nella loro sensibilità, migliore rispetto alle vecchie testine induttive, e nella loro dimensione ridottissima, cosa che consente di seguire il passo delle evoluzioni verso il nanometro per quanto riguarda l’ area di un singolo bit. Infine, il prossimo futuro vedrà protagoniste della scena le testine di lettura basate sulle magnetic tunneling junction, MTJ.

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Hard Drive

The data are typically stored on disk by following a well-defined physical allocation scheme whereby you can reach the area where you can read / write data to disk. One of the most common is called CHS acronym for the English word Cylinder / Head / Sector (Cylinder / Head / Sector), in this structure the data is stored as a physical address having a number for each of the following physical entities:

structure of the surface of a plate
A) Track
B) Sector
C) Sector of a track
D) Cluster, along of contiguous sectors

Plate

a hard disk consists of one or more disks in parallel, with each area, called "flat" and identified by a unique number, is for storing data.

Track

each plate consists of several concentric rings numbered, called tracks, each identified by a unique number.

cylinder

the set of tracks at the same distance from the center on all the discs is said cylinder. Match All tracks with the same number but different dish.

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each plate is divided into circular sectors, or in slices in the same radial each identified by a unique number.

Block

The set of sectors in the same location in all dishes.

head

On each plate is a head to read or write access to data stored on the plate, the position of that head is solidarity with all the other dishes on the other. In other words, if a head is positioned over a track, all the heads are positioned in the cylinder to which the track belongs.

This structure introduces a physical disk geometry that consists of a series of "coordinate" CHS, indicating expressible cylinder, head, sector. In this way you can uniquely address each block of data on the disk. For example, if a hard disk consists of two disks (or equivalently 4 plates), 16384 cylinders (or equivalently 16,384 tracks per plate) and 16 sectors of 4096 bytes per track, then the disk capacity is 4 × 16 × 16384 × 4096 bytes, or 4 GiB.

The interleaving factor is the number of sectors of the hard disk that you must jump to read sequentially all of the track. This depends largely on the performance characteristics of the hard disk itself, ie the speed of rotation of the disc, by the movement of seekers with their heads, and the speed of read-write head of the same.

This process was initially introduced as the CPU, receiving and reworking of the data read, do these things at a slower rate of speed read / write to your hard drive, and then, once revised data from a field The head are already past the beginning of the next sector. Alternating areas on a regular basis and reading according to the specific interleaving factor, speeds up disk rigido e il calcolatore. I moderni dischi rigidi non necessitano di interleaving.

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Important: Firmware Hard Disk Sagate

Un problema di firmware è stato rilevato su un piccolo numero di Hard Disk Seagate (delle famiglie Barracuda 7200.1, Barracuda ES.2 SATA e DiamondMax 22) che può portare, dopo uno spegnimento e riaccensione, alla non disponibilità d’accesso ai dati. Seagate ha, per questo motivo, rilasciato un aggiornamento del firmware di questi prodotti, che potete trovare su questo link:

http://seagate.custkb.com/seagate/crm/selfservice/search.jsp?DocId=207931

PS: L’aggiornamento the firmware of a Hard Disk is certainly not something to be done lightly and without jurisdiction. It is recommended before making a backup outside of the data contained therein and in any case to have it done by a qualified

Who Is Pattycake Online

The firmware is a program designed as a sequence of instructions, integrated directly into a component electronics in the broadest sense of the term (integrated circuit boards, peripherals). The purpose of the program is to start the component itself and allow it to interact with other components through the implementation of communication protocols or programming interfaces.

Quando si parla di firmware per una scheda elettronica (come una scheda di espansione per computer) questo generalmente trova posto all'interno di una memoria ROM o flash. Quando invece il firmware è integrato all'interno di un processore (come ad esempio il Pentium4) in italiano viene detto anche microcodice.

Il termine deriva dall'unione di "firm" (stabile) e "ware" (componente), indica che il programma non è immediatamente modificabile dall'utente finale e che si tratta del punto di incontro fra componenti logiche e fisiche, ossia fra hardware e software.

Il firmware forse più conosciuto in ambito informatico (anche ai non addetti ai lavori) è quello della scheda madre, chiamato commonly responsible for the correct BIOS and restart the computer, but almost always have their firmware also individual components of a computer, such as hard disks, CD players / recorders and DVD, expansion cards in general.

Approndisci subject: firmware corruption