Comparison of several forms of disk storage showing tracks ( not-to-scale ); green denotes start and red denotes end .< nowiki >*</ nowiki > Some CD-R ( W ) and DVD-R ( W )/ DVD + R ( W ) recorders operate in ZCLV, CAA or CAV modes.

Some racing clutches use small multi-plate disk packs that are not part of the flywheel.

Some older tape drives-such as the DECtape, the ZX Microdrive and the Rotronics Wafadrive-were designed as inexpensive alternatives to disk drives which were at the time very expensive.

Some directory operations ( including < tt > unlink </ tt >( 2 )) are not synchronous on ReiserFS, which can result in data corruption with applications relying heavily on file-based locks ( such as mail transfer agents qmail and Postfix ) if the machine halts before it has synchronized the disk.

Some low-cost peripherals no longer contain non-volatile memory for firmware, and instead rely on the host system to transfer the device control program from a disk file or CD.

Comparison of several forms of disk storage showing tracks ( not-to-scale ); green denotes start and red denotes end .< nowiki >*</ nowiki > Some CD-R ( W ) and DVD-R ( W )/ DVD + R ( W ) recorders operate in ZCLV, CAA or CAV modes.

Some operating systems include tools for " collecting " entropy from the timing of unpredictable operations such as disk drive head movements.

Some versions of DOS don't assign the drive letter, beginning with C :, to the first active primary partition recognized upon the first physical hard disk, but on the first primary partition recognized of the first hard disk, even if it is not set active.

Some implementations do not neatly fit either category: a DOM approach can keep its persistent data on disk, cleverly organized for speed ( editors such as SoftQuad Author / Editor and large-document browser / indexers such as DynaText do this ); while a SAX approach can cleverly cache information for later use ( any validating SAX parser keeps more information than described above ).

Some disk imaging utilities omit unused file space from source media, or compress the disk they represent to reduce storage requirements, though these are typically referred to as archive files, as they are not literally disk images.

Some government agencies ( e. g., NSA ) require that all disk drives be physically pulverized when they are discarded, and in some cases, chemically treated with corrosives before or after.

Some bulges have similar properties to those of elliptical galaxies ( scaled down to lower mass and luminosity ); others simply appear as higher density centers of disks, with properties similar to disk galaxies.

Some calculations show that interaction with the disk can cause rapid inward migration, which, if not stopped, results in the planet reaching the " central regions still as a sub-Jovian object.

Some BIOSes ( like the IBM PC / AT ) perform the check only for fixed disk / removable drives, while for floppies and superfloppies it is enough to start with a byte greater or equal to < tt > 06h </ tt > and the first nine words not to contain the same value, before the boot sector is accepted as valid, thereby avoiding the explicit test for < tt > 0x55 </ tt >, < tt > 0xAA </ tt > on floppies.

Some machines have a serial number in ROM, while others do not, and so some other metric, such as the date and time ( to the second ) of initialization of the hard disk can be used.

Some of the performance parameters in the superblock included number of tracks and sectors, disk rotation speed, head speed, and alignment of the sectors between tracks.

Some software, e. g. ADTPro, makes use of this to store Apple II and Apple III versions of a program on the same disk, which is then bootable on both systems.

Comparison of several forms of disk storage showing tracks ( not-to-scale ); green denotes start and red denotes end .< nowiki >*</ nowiki > Some CD-R ( W ) and DVD-R ( W )/ DVD + R ( W ) recorders operate in ZCLV, CAA or CAV modes.

Some schools had simple local area networks of Scandis computers, where 10-20 machines shared one hard disk of typically 10MB capacity.

Some optical disk software, such as IsoBuster, can support Mount Rainier on non-MR drives.

Some ATs came with one high-density ( HD ) disk drive and one double-density ( DD ) 360 kB drive.

Some, like VirtualBox and VMware Player run on Windows and Linux hosts and can run many other operating systems.

Some operating systems for mobile phones and mobile devices use ELF:

Some constitutions or fundamental laws provide for a head of state who is not only in theory but in practice chief executive, operating separately from, and independent from, the legislature.

( Note: Some older operating systems may handle such values incorrectly ( i. e., signed instead of unsigned ), which would make it impossible to access files larger than 2 GB in size.

Some historians argue that it had ceased to exist by 1791 ; others that it was still operating as late as 1813.

Some Christians favor political and administrative decentralization of the government, with separate Muslim and Christian sectors operating within the framework of a confederation.

Some 500, 000 motorcycles were estimated to be operating in Mali in 2009, with two thirds of them inexpensive Chinese made cycles, known locally as " Jakarta " s, which boast better fuel economy but fewer safety features than more expensive Japanese or Western brands.

Some mask revisions of the 68LC040 contained a bug that prevents the chip from operating correctly when a software FPU emulator is used.

Some train operating companies continue to use the former British Rail Rail Alphabet lettering to varying degrees in station signage, although its use is no longer universal ; however it remains compulsory ( under Railway Group Standards ) for safety signage in trackside areas and is still common ( although not universal ) on rolling stock.

Some problems were classic subjects of comparison with other operating systems:

Some printers have IrDA receivers, allowing IrDA-equipped PDAs to print to them, if the PDA's operating system supports it.

( Some legacy operating systems, including early versions of Unix and Windows, limited passwords to an 8 character maximum, reducing security.

Some of the uses in the new series include: repairing electronic equipment ; re-attaching materials such as barbed wire ; detecting, intercepting and sending signals ; remotely operating the TARDIS ; burning, cutting, or igniting substances ; fusing metal ; scanning and identifying substances ; amplifying or augmenting sound ; modifying mobile phones to enable " universal roaming ”; disabling alien disguises ; resonating concrete ; reversing teleportation of another entity.

Some trains had power, but the signals did not, requiring special operating procedures to ensure safety.

Some editors, such as WordStar, have dual operating modes allowing them to be either a text editor or a word processor.

Some text editors provide a way to insert the output of a command issued to the operating system's shell.

Some installations use Linux for zSeries to run Web servers, where Linux runs as the operating system within many virtual machines.

Some operating systems can control Wake-on-LAN behaviour via hardware drivers.

Some groundcrew are linked to specific airlines operating at the airport.

Some machines, like the Atari ST microcomputer, were " instant-on ", with the operating system executing from a ROM.

Some operating systems are supplied in both server and desktop versions with similar user interface.

Some scammers are part of less organized gangs or are operating independently ; such scammers have reduced access to the above connections, and thus have little success with wealthier investors or business entities attempting to research them, but are still convincing to middle-class individuals and small businesses, and can bilk hundreds of thousands of dollars from such victims.

Some operating systems such as early versions of Unix did not support attaching debuggers to running processes, so core dumps were necessary to run a debugger on a process's memory contents.