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's hard disk world's smallest ... awkward to think of taking a data recovery on a disk as ...

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Data Recovery Raid

A Redundant Array of Independent Disks ("redundant array of independent disks, RAID) is a computerized system that uses a set of hard drives to share or replicate the information.

The benefits of RAID are to enhance data integrity, fault tolerance and / or performance, than using a single disk.
In its simplest level, RAID allows you to combine a set of disks in one logical unit.

In this way the operating system, instead of seeing different disks, it sees only one. The
RAID is typically used in servers, and is usually implemented with the same capacity disks.
With the decline in the cost of hard drives and RAID technology, with the spread in motherboard chipsets, RAID is often offered as an option on both the high-end computers and on those used by home users, especially if spent on tasks that require a large data storage, such as audio / video editing.

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Small Computer System Interface

The SCSI (acronym for Small Computer System Interface) is an interface standard designed to achieve the transfer of data between various devices inside a computer (called devices) interconnected by a bus. SCSI should be delivered using the Anglo-Saxon spelling (eg the example is similar to the pronunciation of the name of the show CSI), but a widespread practice as wrong, as is often Italianate SCASI .

To connect a computer to a host bus connection requires a SCSI host adapter that handles the data transfer on the bus. The device must have a SCSI controller, which is usually embedded in all devices, except those of older design. The SCSI interface is mostly used for communication with units hard disk and tape drives, mass storage, but also for connecting a wide range of devices, such as image scanners, readers and writers of CD (CD- R and CD-RW), DVD players. In fact, the SCSI standard was designed to encourage intercambiabiltà and compatibility of the devices (all, at least in theory). There are also SCSI printers.

In the past, the SCSI interface was very common in all types of computers, while currently only is widely used in workstations, servers and peripherals range high (ie high performance). Desktop computers and poratili are usually equipped with ATA / IDE (Advanced Technology Attachment respectively and Integrated Drive Electronics) for the gl hard disk and the USB interface ( Universal Serial Bus) to other commonly used peripherals. These interfaces are slower than SCSI, but also cheaper. Note that the USB uses the same SCSI command set to implement some of its features.

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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.