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In computing, an address space defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector, memory cell, or other logical or physical entity. In order for software programs to store and retrieve stored data, each piece of data must have an address by which it can be found. The number of address spaces available depends on the underlying addressing structure, which is usually limited by the computer architecture used. The address space in a virtual memory system often corresponds to a top-level translation table, such as B. the segment table on the IBM System370. Address spaces are created by combining enough uniquely identified qualifiers to make an address unique within the address space. For a persons physical address, the address space would be a combination of locations such as neighborhood, city, town, or country. Some elements of a data address space can be the same, but if any address element is different, the addresses in that space refer to different entities. For example, there may be multiple buildings at the same address, 32 Main Street, but in different cities, proving that different cities have different, albeit similarly laid out, address spaces. An address space typically provides (or allows for) partitioning into multiple areas, depending on its mathematical structure. In general order, they are simple chunks in terms of memory addresses. Similar to the hierarchical design of postal addresses, some hierarchies of nested domains appear as a controlled ordered tree, e.g. B. in a domain name system or a directory structure. On the Internet, the Internet Assigned Numbers Authority (IANA) allocates ranges of IP addresses to different registries, allowing each to manage its own portions of the Internets global address space.1 Examples of uses of addresses include, but are not limited to: main memory, memory-mapped IO, and virtual memory addresses; device addresses on the expansion bus; sector addressing for drives; file names in a given volume; Various types of network host addresses on computer networks; Unified Resource Locators on the Internet. Address Mapping and Translation Illustration of the translation from logical block addressing to physical geometry Another common feature of address spaces are mappings and translations, which often form multiple layers. This usually means that a higher-level address must somehow be translated into lower-level addresses. For example, a file system on a logical disk works with linear sector numbers, which in simple cases have to be converted into absolute LBA sector addresses by adding the address of the first sector of the partition. In a disk drive connected via Parallel ATA, each of them must be converted to a logical cylinder head sector address due to the historical shortcomings of the interface. The disk controller translates it back to the LBA and finally to the physical cylinder, head and sector nIn computing, an address space defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector, memory cell, or other logical or physical entity. In order for software programs to store and retrieve stored data, each data point must have an address by which it can be found. The number of address spaces available depends on the basic addressing structure, which is usually limited by the architecture of the computer being used. An address space in a virtual memory system often corresponds to a top-level translation table, such as B. the segment table on the IBM System370. Address spaces are created by combining enough uniquely identified qualifiers to make an address unique in the address space. For a persons physical address, the address space would be a combination of locations such as neighborhood, city, town, or country. Some elements of a data address space can be the same, but if an address element differs, the addresses in that space refer to different entities. For example, multiple buildings may be located at the same address, 32 Main Street, but in different cities, indicating that different cities have different, albeit similarly organized, address spaces. An address space usually allows (or enables) partitioning into multiple regions according to its mathematical structure. In normal order, like memory addresses, they are simple chunks. Similar to the hierarchical design of postal addresses, some nested domain hierarchies appear like an ordered tree, e.g. B. in a domain name system or a directory structure. On the Internet, the Internet Assigned Numbers Authority (IANA) allocates ranges of IP addresses to different registries, allowing each to manage its own portions of the Internets global address space.1 Examples of addressing usages include, but are not limited to: main memory, memory-mapped IO, and virtual memory addresses; device addresses on the expansion bus; sector addressing of drives; The names of the files in this volume; Various types of network host addresses on computer networks; Unified resource search engines on the Internet. Address Mapping and Translation Illustration of the translation from logical block addressing to physical geometry Another common feature of address spaces are mappings and translations, which often form multiple layers. This usually means that a higher-level address must somehow be translated to a lower-level address. For example, a file system on a logical disk uses linear sector numbers, which in simple cases must be converted to absolute LBA sector addresses by adding the address of the first sector of the partition. Then, due to the historical shortcomings of the interface, a disk connected via Parallel ATA must convert each of them into a logical address of the cylinder head sector. The disk controller converts it back to LBA and finally to a physical cylinder, head and sector n.

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