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Cboe Global Markets. The Chicago Board Options Exchange ( CBOE ), located at 433 West Van Buren Street in Chicago, is the largest U.S. options exchange with an annual trading volume of around 1.27 billion at the end of 2014. [1] CBOE offers options on over 2,200 companies, 22 stock indices, and 140 exchange-traded funds (ETFs).
The Beulé Gate is a fortified gate leading to the Propylaia of the Acropolis of Athens, Greece.It was constructed largely of repurposed material taken from the 4th-century BCE Choragic Monument of Nikias and integrated into the Post-Herulian Wall, a late Roman fortification built around the Acropolis in the years following the city's sack by the Germanic Heruli people in 267 or early 268 CE.
Polynesia. Polynesia is one of three major cultural areas of the Pacific Ocean islands, along with Melanesia and Micronesia. Subregions ( Melanesia, Micronesia, Polynesia, and Australasia ), as well as sovereign and dependent islands of Oceania. Polynesia is generally defined as the islands within the Polynesian Triangle.
- History
- Design
- Limitations
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Apple File System was announced at Apple's developers’ conference (WWDC) in June 2016 as a replacement for HFS+, which had been in use since 1998. APFS was released for 64-bit iOS devices on March 27, 2017, with the release of iOS 10.3, and for macOS devices on September 25, 2017, with the release of macOS 10.13. Apple released a partial specificat...
The file system can be used on devices with relatively small or large amounts of storage. It uses 64-bit inode numbers, and allows for more secure storage by using a technology called Data Protection. The APFS code, like the HFS+ code, uses the TRIM command for better space management and performance. It may increase read-write speeds on iOS and ma...
While APFS includes numerous improvements relative to its predecessor, HFS+, a number of limitations have been noted.
In March 2018, the APFS driver in High Sierra was found to have a bug that causes the disk encryption password to be logged in plaintext.In January 2021, the APFS driver in iOS < 14.4, macOS < 11.2, watchOS < 7.3, and tvOS < 14.4 was found to have a bug that allowed a local user to read arbitrary files, regardless of their permissions.macOS
An experimental version of APFS, with some limitations, is provided in macOS Sierra 10.12.4. It is available through the command line diskutil utility. Among these limitations, it does not perform Unicode normalization while HFS+ does, leading to problems with languages other than English. Drives formatted with Sierra’s version of APFS may also not be compatible with later versions of macOS or APFS, and the Sierra version of APFS cannot be used with Time Machine, FileVault volumes, or Fusion...
iOS, tvOS, and watchOS
iOS 10.3, tvOS 10.2, and watchOS 3.2 convert the existing HFSXfile system to APFS on compatible devices.
Third-party utilities
Despite the ubiquity of APFS volumes in today's Macs and the format's 2016 introduction, third-party repair utilities continue to have notable limitations in supporting APFS volumes, due to Apple's delayed release of complete documentation. According to Alsoft, the maker of DiskWarrior, Apple's 2018 release of partial APFS format documentation has delayed the creation of a version of DiskWarrior that can safely rebuild APFS disks.Competing products, including MicroMat's TechTool and Prosoft's...
Apple Developer: Apple File System GuideApple Developer: Apple File System ReferenceWWDC 2016: Introduction of APFS by Apple software engineers Dominic Giampaoloand Eric TamuraInformation science. Information technology ( IT) is a set of related fields that encompass computer systems, software, programming languages, and data and information processing, and storage. [1] IT forms part of information and communications technology (ICT). [2] An information technology system ( IT system) is generally an information ...
SCADA ( supervisory control and data acquisition) is a control system architecture comprising computers, networked data communications and graphical user interfaces for high-level supervision of machines and processes. It also covers sensors and other devices, such as programmable logic controllers, which interface with process plant or machinery.
The Domain Name System ( DNS) is a hierarchical and distributed name service that provides a naming system for computers, services, and other resources in the Internet or other Internet Protocol (IP) networks. It associates various information with domain names (identification strings) assigned to each of the associated entities.
