A memory card reader is a small storage medium that uses USB SPI i2c memory to save the information, earlier models required the use of battery which is no longer the case. These memories are resistant to external scratches and dust that have plagued previous forms of portable storage, such as CDs.
Other storage devices or flash drives are magnetic storage devices with high capacity. Punched tape: it is a very outdated, consisting of cards or paper tape punch. Flash memory is a type of memory that is marketed for use in portable devices such as digital cameras or PDAs. The corresponding device or a card reader connected to the computer via USB or Firewire.
Disks and tapes of large capacity are special units that are used for backup for companies and research centers. Its storage capacity can be hundreds of gigabytes. The information stored on any of these devices must have some mechanism to restore the information, ie restore the data to its original state in case an event does not allow us to access the original data, making it necessary to go to the copy we had done previously.
For this data restoration methods are different from a simple copy through command like “copy” of DOS, the “cp” Linux and Unix systems, or tools of various computers. Information is measured through different terms. Data Recovery is the process of restoring the information on secondary storage devices damaged, defective, corrupted, inaccessible or can not be accessed normally.
For example, the most common proximity contactless cards can be tampered with in the workshops for the manufacture of counterfeit versions using equipment available on the open market. Therefore, for sites that require a higher level of protection, such identifiers are not suitable. Fundamentally, a higher level of security is provided by RFID tags, in which the card code is stored in a secure USB SPI i2c area and encrypted.
In addition to direct use in access control, RFID tags are widely used in other areas. For example, in the local card payment systems. This is the brain of the system: it determines whether or not to allow entry the ID owner at the door, because it stores the identifier codes with a list of the access rights of each of them.
When a person swipes a security access control card, the code is compared to those stored in the database. Controllers require a power supply, so they usually have their own battery which supports their performance from a few hours to a few days in case of a power outage.
