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.

References in periodicals archive ?
Integrity: Stored data encryption should eliminate integrity issues by authenticating tape media at the block level.
Today's solutions seek to reduce disk utilization by compressing the data or reducing unintended redundancy through coalescence at the file or block levels.
No one has a universal file system yet--SAN file system technology tends to be limited to proprietary devices, since it is a huge challenge to share block level and file level data.
With a strong system engineering team and the capability to develop digital, mixed signal and RF block level and complete IC's, NewLogic provides cost effective services to help semiconductor companies and other IC users achieve their business objectives.
Here's the background: DAS and SAN handle data on the block level, while IP-connected NAS manages it on the file level; and never the twain shall meet.
Early block level floorplanning analysis is limited by the availability of block pin assignments.
Chris Van Wagoner, director of product marketing at Comm Vault said, "The backup world in general, and Comm Vault in particular, has looked to block level technologies to provide better performance.
By using a flexible architecture that can be customized for applicable markets, the system can monitor quality at the macro block level through comparison among different formats, such as HDTV, SDTV, SDI & analog TV and is ideal for live on-air systems including cable, terrestrial and mobile broadcasting applications.