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Hard disk drives store data in the magnetic polarization of small patches of the surface coating on a disk. The maximum areal density is defined by the size of the magnetic particles in the surface, as well as the size of the "head" used to read and write the data. In 1956 the first hard drive, the IBM 350, had an areal density of 2,000 bit/in 2.
Steve Bass of PC World provided a brief review of the 1.1.2 release of WinDirStat, summarizing its usefulness: "Windirstat is [a] colorful and nifty tool to check the makeup of your hard drive -- especially if you're looking for immense files. It scans your drive and produces a treemap that shows each file as a colored rectangle that's ...
The software is designed to find, test, diagnose and repair hard disk drives, reveal problems, display health and avoid failures by using S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) function of hard disk drives. [34] [35] [36] The detected information can be saved to file in formats such as HTML, text, or XML. [37] [38] [39]
The information displayed by Speccy includes processor brand and model, hard drive size and speed, amount of memory , information about graphics card and operating system. Speccy is used to monitor what hardware is present in a system and how it is being used. [6] [7] [8] [9]
However, the Linux test environment automatically removed the HPA on the test drive, allowing the tool to image sectors hidden by an HPA. The tool did not acquire sectors hidden by a DCO." [4] AccessData's FTK Imager 2.5.3.14 was validated by the National Institute of Justice (NIJ) in June 2008. Their findings indicated that "If a physical ...
On SCSI hard disk drives, the SCSI controller can directly control spin up and spin down of the drives. Some Parallel ATA (PATA) and Serial ATA (SATA) hard disk drives support power-up in standby (PUIS): each drive does not spin up until the controller or system BIOS issues a specific command to do so. This allows the system to be set up to ...
The drive remains operable during the test. [110] There is a dedicated log for background scan results, separate from the self-test log. Offline data collection ATA drives may support a periodic short operation called "offline data collection". Although this feature is marked "obsolete", many modern hard drives retain this feature.
Video hard drives, sometimes called "surveillance hard drives", are embedded into digital video recorders and provide a guaranteed streaming capacity, even in the face of read and write errors. [148] Drives embedded into automotive vehicles; they are typically built to resist larger amounts of shock and operate over a larger temperature range.