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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References in periodicals archive ?
Sensory block height was assessed at 1 minute interval using pin prick test in mid clavicular line until it reached T10 level and then every 2 minutes until it reached peak sensory block level (PSBL).
CloudBerry Lab is working on the Block Level Backup functionality for smaller files as part of the Advanced Backup Mode with the encryption, compression and versioning support.
* 58 percent of technical assistance is available at block level, 26 percent of its is available at District and block level where as 11 percent is available at all levels.
Other companies' NAS heads support block level data access as well as file level data access.
Results, from pH, P, and K, indicated significant variation at the block level. The resulting significance was found to support soil property variation across the entire field at the block level.
Data tabulations will be to the block level. The data will be available through the Internet, on CD-ROM and DVD and on printed report.
AMERICAN FORESTS is using its CITYgreen software, aerial photographs, and extensive ground-truthing to conduct more detailed analyses at the city block level of some 60 to 80 sites.
Summary: New Delhi [India], July 12 (ANI): In view of the upcoming assembly election in the city-state, a meeting of Congress Committee observers from 14 districts was held here at Rajiv Bhawan on Friday to discuss and ensure the appointment of 280 block level presidents of the committee within 10 days.
The PBS provided maps of census Charges and Circles as well as the maps of urban and rural blocks besides providing census results up to block level in both soft and hard form.
The device offers device-to-device replications, ISCSI block level access, RAID 1 configuration for efficient storage utilisation, Windows Active Directory support, user replaceable hard drives and VMware certification.