The reason why Commodore decided not to use the upper five tracks by default ( or at least more than 35 ) was the bad quality of some of the drive mechanisms which did not always work reliably at the highest tracks.

It was a single-sided, 170KB version of the double-sided Commodore 1571, released as a stopgap measure when Commodore International was unable to provide large enough quantities of 1571s due to a shortage of double-sided drive mechanisms.

Commodore chose not to use the upper five tracks by default ( or at least to use more than 35 ) due to the bad quality of some of the drive mechanisms, which did not always work reliably on those tracks.

The 80286 provided built in memory protection mechanisms which had been almost exclusive to mainframes and minicomputers ( CPUs like the NS320xx and M68000 needed additional components in order to implement MMU functions ) and the large performance enhancements represented by the 80286 and many of its successors would pave the way for the x86 and the IBM PC architecture to extend from low performance personal computers all the way to high-end workstations and servers and even drive the market for other architectures.

Modern torpedoes utilize a variety of drive mechanisms, including gas turbines ( the British Spearfish ), monopropellants, and sulphur hexafluoride gas sprayed over a block of solid lithium.

The various conditions can use one or more physical mechanisms to lower the solubility of the molecule ; for example, some may change the pH, some contain salts of the Hofmeister series or chemicals that lower the dielectric constant of the solution, and still others contain large polymers such as polyethylene glycol that drive the molecule out of solution by entropic effects.

Using vibration monitoring, it can be observed that each tap change operation generates a signal that contains information about the condition of the tap changer contacts and the drive mechanisms.

To prevent corrosion, saltwater fly reels often use aerospace aluminum frames and spools, electroplated and / or stainless steel components, with sealed and waterproof bearing and drive mechanisms.

Though RAM drives can often be supported directly from the operating system via special mechanisms in the operating system kernel, it is possible to also create and manage a RAM drive by way of a user space application process.

In file systems lacking such naming mechanisms, drive letter assignment proved a useful, simple organizing principle.

Cytoskeletal rearrangements mediate the shape changes of PMCs ; though the cytoskeleton assists in the mechanics of ingression, other mechanisms drive the process.

In one instance, this has resulted in severe corrosion to control rod drive mechanisms when the boric acid solution leaked through the seal between the mechanism itself and the primary system.

The latter problem has not stopped Subaru from using it in its all-wheel drive cars, where the difficulty of fitting the short engine between the front wheels ahead of the front axle is compensated for by the ease of locating the transmission and four-wheel drive mechanisms behind it, between the front and rear axles.

The disk drives used either Siemens or MPI full-height single-sided drive mechanisms, but the drive electronics board was replaced by an Osborne-designed board, which allowed both power and signal connections to be carried on the same ribbon cable from the motherboard.

" The combination of two mechanisms ( one, which temporarily suspends leptin action when presented with excess of high-quality food, and the other, which blunts the processes that could drive the body weight back to " normal "), could explain the current obesity epidemic without invoking any metabolic disorders or " villain " nutrients.

Apple has used the name to refer to a number of underlying drive mechanisms ; as of December 2006, SuperDrives are combination DVD ± RW and CD-RW writer drives offering speeds of 8 – 24X and supporting the DVD ± R, DVD + R DL, DVD-R DL, DVD ± RW, DVD-9, CD-R, and CD-RW formats along with all normal read-only media.

Hybrid saw drive mechanisms vary more than contractor saws and cabinet saws.

The use of clepsydrae to drive mechanisms illustrating astronomical phenomena began with Zhang Heng ( 78-139 ) in 117, who also employed a waterwheel.

When the drive wheels begin to slip, one of the locking mechanisms discussed above joins the front and rear axles.

In pressurised water reactors ( PWR ), they are inserted from above, the control rod drive mechanisms being mounted on the reactor pressure vessel head.

Launch was originally scheduled for 9 March, but during processing work at Pad A, significant cracks were found on all four lug hinges on the two external tank umbilical door drive mechanisms.

Until the advent of computer controlled drive mechanisms, the standard solution was some form of equatorial mount, and for small telescopes this is still the norm.

Both plants and animals have evolved mechanisms allowing them to survive extremes.

Hofstadter collects and studies cognitive errors ( largely, but not solely, speech errors ), " bon mots " ( spontaneous humorous quips ), and analogies of all sorts, and his long-time observation of these diverse products of cognition, and his theories about the mechanisms that underlie them, have exerted a powerful influence on the architectures of the computational models developed by himself and FARG members.

EP is closely linked to sociobiology, but there are key differences between them including the emphasis on domain-specific rather than domain-general mechanisms, the relevance of measures of current fitness, the importance of mismatch theory, and psychology rather than behaviour.

Work on " Skilled Memory and Expertise " by Anders Ericsson and James J. Staszewski confronts the paradox of expertise and claims that people not only acquire content knowledge as they practice cognitive skills, they also develop mechanisms that enable them to use a large and familiar knowledge base efficiently.

Mechanisms such as reflection on actual or mental actions vis-à-vis alternative solutions to problems, tagging new concepts or solutions to symbols that help one recall and mentally manipulate them are just a few examples of how mechanisms of cognitive development may be used to facilitate learning.

They have their origins in the tools developed in the 18th century by makers of clocks and watches and scientific instrument makers to enable them to batch-produce small mechanisms.

The MMU and protection mechanisms are enabled only in case of protected mode ( except for the segment overrun protection ) keeping them disabled in real mode of operation.

An essay in support of creationism published in 1994 referred to bacterial flagella as showing " multiple, integrated components ", where " nothing about them works unless every one of their complexly fashioned and integrated components are in place " and asked the reader to " imagine the effects of natural selection on those organisms that fortuitously evolved the flagella ... without the concommitant control mechanisms ".

Mangroves ' ability to survive the salt water through intricate molecular mechanisms, their unique reproductive cycle, and their ability to grow in the most oxygen-deprived waters have allowed them extensive growth in hostile areas of the gulf.

Eysenck's theory, however, does propose biological mechanisms as driving traits, and modern behavior genetics researchers have shown a clear genetic substrate to them.

To avoid these problems, plants developed mechanisms that limit sodium uptake by roots, store them in cell vacuoles, and control them over long distances ; excess sodium may also be stored in old plant tissue, limiting the damage to new growth.

Over a dozen countries have now adopted comprehensive whistleblower protection laws which create mechanisms for reporting, investigate reports, and provide legal protections to the people who informed them.

This protects critical Windows system files by preventing programs other than Microsoft's operating system update mechanisms such as the Package Installer, Windows Installer and other update components from modifying them.

" The market for home machines was created through technological innovation and pricing: Phonographs, gramophones, and graphophones were cleverly adapted to run by spring-motors ( you wound them up ), rather than by messy batteries or treadle mechanisms, while the musical records were adapted to reproduce loudly through a horn attachment.

At high degrees of partial melting of the crust, granitoids such as tonalite, granodiorite and monzonite can be produced, but other mechanisms are typically important in producing them.

WMCF advocates ( and includes some examples of ) a cognitive idea analysis of mathematics which analyzes mathematical ideas in terms of the human experiences, metaphors, generalizations, and other cognitive mechanisms giving rise to them.

The tillage kills the weeds via 2 mechanisms: uprooting them, burying their leaves ( cutting off their photosynthesis ), or a combination of both.

Butterflies have evolved mechanisms to sequester these plant toxins and use them instead in their own defense.

These arousals are driven by internal mechanisms, and external stimuli often fail to wake them.

So QoS mechanisms can avoid the undesirable loss of VoIP packets by immediately transmitting them ahead of any queued bulk traffic on the same link, even when that bulk traffic queue is overflowing.

* The neurophysiological mechanisms which contribute to the written movement are related to conditions within the central nervous system and vary in accordance with them.

In this article we distinguish the high-level programming paradigms of generic programming, above, from the lower-level programming language genericity mechanisms used to implement them ( see Programming language support for genericity ).

Several mechanotransduction mechanisms have been proposed as reasons for the response of tenocytes to mechanical force that enable them to alter their gene expression, protein synthesis, and cell phenotype, and eventually cause changes in tendon structure.