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Head Crash
A head crash is a hard-disk failure that occurs when a disk read-and-write head, read–write head of a hard disk drive makes contact with its rotating hard disk platter, platter, slashing its surface and permanently damaging its magnetic media. It is difficult to recover data from a head crashed drive. It is most often caused by a sudden severe motion of the disk, for example the jolt caused by dropping a laptop to the ground while it is operating or physically shocking a computer. Laptop 2.5 drives are significantly more likely to have a head crash due to their mobile nature despite having higher shock resistance than 3.5 desktop drives. Desktop drives being larger are more prone to damage if dropped but are usually in one place like in a computer/server so they are overall less likely to have a head crash. Head details A head normally rides on Air bearing, a thin film of moving air entrapped at the surface of its platter (some drives manufactured by Conner Peripherals in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hard Disk Head Crash
Hard means something that is difficult to do. It may also refer to: * Hardness, resistance of physical materials to deformation or fracture * Hard water, water with high mineral content Arts and entertainment * Hard (TV series), ''Hard'' (TV series), a French TV series * Hard (band), a Hungarian hard rock supergroup * Hard (music festival), in the U.S. Albums * Hard (EP), ''Hard'' (EP), Goodbye Mr Mackenzie, 1993 * Hard (Brainpower album), ''Hard'' (Brainpower album), 2008 * Hard (Gang of Four album), ''Hard'' (Gang of Four album), 1983 * Hard (Jagged Edge album), ''Hard'' (Jagged Edge album), 2003 * Hard (Shinee album), ''Hard'' (Shinee album), 2023, and its title track * ''Hard'', a 2017 EP from the band The Neighbourhood Songs * Hard (Rihanna song), "Hard" (Rihanna song), 2009 * Hard (Sophie song), "Hard" (Sophie song), 2014 * "Hard", a song by Royce da 5'9" from the 2016 album ''Layers (Royce da 5'9" album), Layers'' * "Hard", a song by Why Don't We from the 2018 album ''8 L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Free Fall Sensor
An accelerometer is a device that measures the proper acceleration of an object. Proper acceleration is the acceleration (the rate of change of velocity) of the object relative to an observer who is in free fall (that is, relative to an inertial frame of reference). Proper acceleration is different from coordinate acceleration, which is acceleration with respect to a given coordinate system, which may or may not be accelerating. For example, an accelerometer at rest on the surface of the Earth will measure an acceleration due to Earth's gravity straight upwards of about ''g'' ≈ 9.81 m/s2. By contrast, an accelerometer that is in free fall will measure zero acceleration. Accelerometers have many uses in industry, consumer products, and science. Highly sensitive accelerometers are used in inertial navigation systems for aircraft and missiles. In unmanned aerial vehicles, accelerometers help to stabilize flight. Micromachined micro-electromechanical systems (MEMS) accelerom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Click Of Death
Click of death is a term that had become common in the late 1990s referring to the clicking sound in disk storage systems that signals a disk drive has failed, often catastrophically. The clicking sound itself arises from the unexpected movement of the disk's read/write actuator. At startup, and during use, the disk head must move correctly and be able to confirm that it is correctly tracking data on the disk. If the head fails to move as expected or upon moving cannot track the disk surface correctly, the disk controller may attempt to recover from the error by returning the head to its home position and then retrying, at times causing an audible "click". In some devices, the process automatically retries, causing a repeated or rhythmic clicking sound, sometimes accompanied by the whirring sound of the drive plate spinning. Origin of the term The phrase "click of death" originated to describe a failure mode of the Iomega ZIP drives, appearing in print as early as January 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bad Sector
Bad Sector is an ambient/noise project formed in 1992 in Tuscany, Italy by Massimo Magrini. While working at the Computer Art Lab of ISTI in Pisa (one of the CNR institutes), he developed original gesture interfaces that he uses in live performances: 'Aerial Painting Hand' (a device that tracks the position of the musician's hands in gloves of two different colors), 'UV-Stick' (an ultraviolet-illuminated stick that the musician moves in front of the camera—a computer reads its position and angle and makes changes to music generation algorithms accordingly), and others. Bad Sector's music is considered a mixture of ambient, noise, industrial music, minimal and experimental music. Magrini himself describes it as "deeply emotional dark ambient noise". Common themes (as reflected in album and track titles) include microbiology, algorithms, physics, and space exploration. See also *List of ambient music artists References External links Bad Sector official websiteF ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Active Hard-drive Protection
In computer hardware, active hard-drive protection refers to technology that attempts to avoid or reduce mechanical damage to hard disk drives by preparing the disk prior to impact. This approach is mainly used in laptop computers that are frequently carried around and more prone to impacts than desktop computers. Implementation Usually, the system consists of accelerometers that alert the system when excess acceleration or vibration is detected. The software then tells the hard disk drive to unload its heads to prevent them from coming in contact with the platters, thus potentially preventing a head crash. Many laptop vendors have implemented this technology under different names. Some hard-disk drives also include this technology, needing no cooperation from the system. See also * Hard disk drive failure * Head crash * Sudden Motion Sensor The Sudden Motion Sensor (SMS) is Apple's motion-based data protection system used in their notebook computer systems. Apple introduce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solid-state Drives
A solid-state drive (SSD) is a type of solid-state storage device that uses integrated circuits to store data persistently. It is sometimes called semiconductor storage device, solid-state device, or solid-state disk. SSDs rely on non-volatile memory, typically NAND flash, to store data in memory cells. The performance and endurance of SSDs vary depending on the number of bits stored per cell, ranging from high-performing single-level cells (SLC) to more affordable but slower quad-level cells (QLC). In addition to flash-based SSDs, other technologies such as 3D XPoint offer faster speeds and higher endurance through different data storage mechanisms. Unlike traditional hard disk drives (HDDs), SSDs have no moving parts, allowing them to deliver faster data access speeds, reduced latency, increased resistance to physical shock, lower power consumption, and silent operation. Often interfaced to a system in the same way as HDDs, SSDs are used in a variety of devices, incl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Windows 7
Windows 7 is a major release of the Windows NT operating system developed by Microsoft. It was Software release life cycle#Release to manufacturing (RTM), released to manufacturing on July 22, 2009, and became generally available on October 22, 2009. It is the successor to Windows Vista, released nearly three years earlier. Windows 7's Windows Server, server counterpart, Windows Server 2008 R2, was released at the same time. It sold over 630 million copies before it was succeeded by Windows 8 in October 2012. Extended support ended on January 14, 2020, over 10 years after the release of Windows 7, and the operating system ceased receiving further updates. A paid support program was available for enterprises, providing security updates for Windows 7 for up to three years since the official end of life. Windows 7 was intended to be an incremental upgrade to Windows Vista, addressing the previous OS's poor reception while maintaining hardware and software compatibility as well as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ThinkPad
ThinkPad is a line of business-oriented laptop and Tablet computer, tablet computers produced since 1992. It was originally designed, created and manufactured by the American IBM, International Business Machines (IBM) Corporation. IBM Acquisition of the IBM PC business by Lenovo, sold its PC business to the Chinese company Lenovo in 2005 and since 2007 all ThinkPad models have been manufactured by them. The ThinkPad line was first developed at the IBM Yamato Facility in Japan; they have a distinct black, boxy design, which originated in 1990 and is still used in some models. Most models also feature a red-colored trackpoint on the keyboard, which has become an iconic and distinctive design characteristic associated with the ThinkPad line. It has seen significant success in the business market while certain models target students and the education market. ThinkPad laptops have been used in outer space and for many years were the only laptops certified for use on the International ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Active Hard-drive Protection
In computer hardware, active hard-drive protection refers to technology that attempts to avoid or reduce mechanical damage to hard disk drives by preparing the disk prior to impact. This approach is mainly used in laptop computers that are frequently carried around and more prone to impacts than desktop computers. Implementation Usually, the system consists of accelerometers that alert the system when excess acceleration or vibration is detected. The software then tells the hard disk drive to unload its heads to prevent them from coming in contact with the platters, thus potentially preventing a head crash. Many laptop vendors have implemented this technology under different names. Some hard-disk drives also include this technology, needing no cooperation from the system. See also * Hard disk drive failure * Head crash * Sudden Motion Sensor The Sudden Motion Sensor (SMS) is Apple's motion-based data protection system used in their notebook computer systems. Apple introduce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RAMAC 305 Disk
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RAMAC may refer to: *IBM 305 RAMAC, a computing system introduced in 1956 *IBM 350 RAMAC, a disk storage unit introduced in 1956 as a bundled component of the IBM 305 RAMAC * IBM 650 RAMAC, a computing system consisting of an IBM 650 with an IBM 355 Disk Storage unit and introduced in 1956 * IBM 9394 RAMAC Array, a disk storage array and controller unit introduced in 1994 which uses data striping In computer data storage, data striping is the technique of segmenting logically sequential data, such as a file, so that consecutive segments are stored on different physical storage devices. Striping is useful when a processing device reques ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Revolutions Per Minute
Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min−1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to hertz. Standards ISO 80000-3:2019 defines a physical quantity called ''rotation'' (or ''number of revolutions''), dimensionless, whose instantaneous rate of change is called ''rotational frequency'' (or ''rate of rotation''), with units of reciprocal seconds (s−1). A related but distinct quantity for describing rotation is ''angular frequency'' (or ''angular speed'', the magnitude of angular velocity), for which the SI unit is the radian per second (rad/s). Although they have the same dimensions (reciprocal time) and base unit (s−1), the hertz (Hz) and radians per second (rad/s) are special names used to express two different but proportional ISQ quantities: frequency and angular frequency, respectively. The conversions between a frequency and an angular frequency ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Data Loss
Data loss is an error condition in information systems in which information is destroyed by failures (like failed spindle motors or head crashes on hard drives) or neglect (like mishandling, careless handling or storage under unsuitable conditions) in storage, transmission, or processing. Information systems implement backup and disaster recovery equipment and processes to prevent data loss or restore lost data. Data loss can also occur if the physical medium containing the data is lost or stolen. Data loss is distinguished from data unavailability, which may arise from a network outage. Although the two have substantially similar consequences for users, data unavailability is temporary, while data loss may be permanent. Data loss is also distinct from data breach, an incident where data falls into the wrong hands, although the term data loss has been used in those incidents. Types *''Procedural'' * ''Intentional action'' ** Intentional deletion of a file or program * ''Unin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
