block level

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block level

Reading and writing a disk at the physical level. The disk controller in every computer and server reads and writes the disks at the block level. In storage area networks (SANs), where the disks are in cabinets external to the server, read/write access is also at the block level.

Block Level Vs. File Level
An application accesses data by file name (logical), which is translated into block level (physical) for reading and writing by the operating system's file system.

Users always deal with data at the file level; however, database and network administrators may get involved at the block level, because they can stipulate where data are physically stored for performance issues.

Although a stand-alone unit with its own disks, a network attached storage (NAS) device has its own file system for file level access. Because a SAN uses block level access and has no file system with its associated overhead, a SAN is much faster than a NAS. See SAN, NAS and file system.

Remote Block Level Access
With IP storage, block level access can be extended via the IP protocol to remote locations. See SAN and IP storage.

Blocks Are Also Logical
Modern drives maintain their own tables of good and bad sectors and remap requests on the fly. As a result, the physical block reads and writes are translated by the drive into actual sector reads and writes, making the block access somewhat like a logical request, rather than 100% physical.

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ySTANBUL (CyHAN)- Although the ystanbul 7th Penal Court of Peace has asked Twitter to block access to the account of Twitter whistleblower Fuat Avni, who recently claimed that President Recep Tayyip Erdoy-an's son Bilal Erdoy-an went to Italy with a large amount of money on Sept.
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The courts ended the case by stating that internet service providers can be forced to block access to Web sites that are into copyright infringement.
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19 ( ANI ): Egypt's telecoms ministry has refused to block access to YouTube and has filed an appeal to reverse a court order asking it to do so.
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It can block access to Facebook during specific times in a week, or completely block access.
LAHORE , May 31, 2010 (Balochistan Times): Lahore High court on Monday asked the government to restore access to social networking site Facebook and said it should develop a system to block access to blasphemous content on the internet and if such content appears again than the Facebook would be banned again.