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(Redirected from QIC)
'Quarter inch cartridge' tape (abbreviated 'QIC', commonly pronounced "quick") is a magnetic tape data storage format introduced by 3M in 1972, with derivatives still in use as of 2007. QIC is a linear tape format, and comes in a rugged enclosed package of aluminum and plastic that holds two tape reels driven by belts. The tape is one quarter inch (1/4") wide and anywhere from 300 to 1500 feet long. Data is written to tape in linear tracks in what is called "serpentine" mode, where the tracks alternate direction by use of a head switch or step. Since the introduction of the format, QIC has been widely used and many variations exist. There is a QIC trade association that publishes QIC standards. These standards include tape that is wider or narrower than 1/4 inch, as well as interfaces and logical formats.
Using a belt drive means that the speed at which the belt was moved was equal to the speed at which the tape would move. This is in contrast to cassette tapes or DATs, which rely on spindles in the reels. It also means that no tension is ever put on the tape: the belt is in contact with both reels, so the tape should maintain a neutral tension at all times.
The tape in a QIC is not physically attached to the reels; rather, a series of holes are punched through the tape to allow the drive to identify the end of the tape. QIC tapes should never be wound past this point, also unlike cassettes and DATs. If a defective drive were to wind a cartridge past this point the tape will come completely off of the reels and the cartridge becomes unusable, although it is a relatively simple matter to open the cartridge and rewind the tape around the reel.
The design of the QIC tape cartridge is very robust: the aluminium and plastic case is an eighth of an inch thick all around and can withstand abuse and impacts that will often damage other tape formats.
However, because the tape is belt-driven, seeking can eventually cause the belt to become unevenly tensioned. Thus, it is periodically necessary to "retension" the cartridge. This is accomplished by winding the tape from beginning to end and back in one operation, allowing the belt to equalize itself. For newer QIC drives which use the SCSI interface, there is a standard SCSI "RETENSION" command to accomplish this.
When the cartridge gets old the rubber band may not provide enough friction to turn the takeup spool smoothly. When this happens the tape will need to be replaced.
The first QIC tape format was the 5.875 in by 3.875 in (150 x 99mm) ''Data Cartridge'' (DC) format with two internal belt-driven reels and a metal base. The original product, the DC300, had 300 feet of tape and held 200 kilobytes. Various QIC DC recording formats have appeared over the years, including:
★ 'QIC-11': a four-track format giving 20 MB on a 450 ft DC300XL cartridge
★ 'QIC-24': nine-track, 45 MB or 60MB on a 450 or 600 ft (DC600A) cartridge respectively
★ 'QIC-120': 15-track, 125 MB on a DC600A
★ 'QIC-150': 18-track, 150 MB, DC6150 cartridge
★ 'QIC-525': 26-track, 525 MB on a 1000 ft DC6525 cartridge
Other QIC DC standards included the 'QIC-02' and 'QIC-36' drive interface standards. Later QIC DC drives usually used the SCSI interface.
Later, the smaller ''Minicartridge'' (MC) form-factor was introduced. This was 2.375 in by 3.125 in (61 x 80mm) size and was small enough to fit in a 3.5 in drive bay.
★ 'QIC-40': 40 MB
★ 'QIC-80': 80 MB
The 'QIC-40' and 'QIC-80' were designed to use the same controller as a standard floppy drive, with MFM or RLL encoding.
Main articles: Travan
'Travan' is an evolution of the QIC Minicartridge format, sold for personal computer use. This version, developed by 3M, uses a longer and wider (8 mm) tape to give higher capacities.
Main articles: Scalable Linear Recording
SLR is Tandberg Data's name for its line of high-capacity QIC data cartridge drives. As of 2005, Tandberg was the only manufacturer of SLR/QIC drives in the world. The largest SLR drive can hold 70 GB of data (140 GB compressed).
A variant from Sony that uses a wider .315 inch (8 mm) tape and increases the recording density. QIC wide drives are backwards compatible with QIC tapes.
''QIC Extra'', a modification to support a longer tapes, and thus more data by the Verbatim Corporation, this was made possible by making the cartridges physically longer.
An interface standard for tape drives using the ATAPI (IDE) interface.
★ The QIC international trade organisation
★ List of different QIC formats
★ Useful details of earliest QIC-11 and QIC-24 formats
★ Introduction to QIC tape drives
'Quarter inch cartridge' tape (abbreviated 'QIC', commonly pronounced "quick") is a magnetic tape data storage format introduced by 3M in 1972, with derivatives still in use as of 2007. QIC is a linear tape format, and comes in a rugged enclosed package of aluminum and plastic that holds two tape reels driven by belts. The tape is one quarter inch (1/4") wide and anywhere from 300 to 1500 feet long. Data is written to tape in linear tracks in what is called "serpentine" mode, where the tracks alternate direction by use of a head switch or step. Since the introduction of the format, QIC has been widely used and many variations exist. There is a QIC trade association that publishes QIC standards. These standards include tape that is wider or narrower than 1/4 inch, as well as interfaces and logical formats.
| Contents |
| Features of QIC |
| Generations |
| 3M Data Cartridge (DC) |
| QIC Mini Cartridge (MC) |
| Travan (TR) |
| SLR |
| QIC-Wide |
| QIC-EX |
| QIC-157 |
| External links |
Features of QIC
Using a belt drive means that the speed at which the belt was moved was equal to the speed at which the tape would move. This is in contrast to cassette tapes or DATs, which rely on spindles in the reels. It also means that no tension is ever put on the tape: the belt is in contact with both reels, so the tape should maintain a neutral tension at all times.
The tape in a QIC is not physically attached to the reels; rather, a series of holes are punched through the tape to allow the drive to identify the end of the tape. QIC tapes should never be wound past this point, also unlike cassettes and DATs. If a defective drive were to wind a cartridge past this point the tape will come completely off of the reels and the cartridge becomes unusable, although it is a relatively simple matter to open the cartridge and rewind the tape around the reel.
The design of the QIC tape cartridge is very robust: the aluminium and plastic case is an eighth of an inch thick all around and can withstand abuse and impacts that will often damage other tape formats.
However, because the tape is belt-driven, seeking can eventually cause the belt to become unevenly tensioned. Thus, it is periodically necessary to "retension" the cartridge. This is accomplished by winding the tape from beginning to end and back in one operation, allowing the belt to equalize itself. For newer QIC drives which use the SCSI interface, there is a standard SCSI "RETENSION" command to accomplish this.
When the cartridge gets old the rubber band may not provide enough friction to turn the takeup spool smoothly. When this happens the tape will need to be replaced.
Generations
3M Data Cartridge (DC)
The first QIC tape format was the 5.875 in by 3.875 in (150 x 99mm) ''Data Cartridge'' (DC) format with two internal belt-driven reels and a metal base. The original product, the DC300, had 300 feet of tape and held 200 kilobytes. Various QIC DC recording formats have appeared over the years, including:
★ 'QIC-11': a four-track format giving 20 MB on a 450 ft DC300XL cartridge
★ 'QIC-24': nine-track, 45 MB or 60MB on a 450 or 600 ft (DC600A) cartridge respectively
★ 'QIC-120': 15-track, 125 MB on a DC600A
★ 'QIC-150': 18-track, 150 MB, DC6150 cartridge
★ 'QIC-525': 26-track, 525 MB on a 1000 ft DC6525 cartridge
Other QIC DC standards included the 'QIC-02' and 'QIC-36' drive interface standards. Later QIC DC drives usually used the SCSI interface.
QIC Mini Cartridge (MC)
Later, the smaller ''Minicartridge'' (MC) form-factor was introduced. This was 2.375 in by 3.125 in (61 x 80mm) size and was small enough to fit in a 3.5 in drive bay.
★ 'QIC-40': 40 MB
★ 'QIC-80': 80 MB
The 'QIC-40' and 'QIC-80' were designed to use the same controller as a standard floppy drive, with MFM or RLL encoding.
Travan (TR)
Main articles: Travan
'Travan' is an evolution of the QIC Minicartridge format, sold for personal computer use. This version, developed by 3M, uses a longer and wider (8 mm) tape to give higher capacities.
| Format | Capacity (MB) | Speed (kB/s) | Tracks |
|---|---|---|---|
| QIC-80 | 80-500 | 62.5 | 28/36 |
| TR-1 | 400 | 62.5 | 36 |
| QIC-3010 | 340 | 62.5 | 40/50 |
| TR-2 | 800 | 62.5 | 50 |
| QIC-3020 | 670 | 62.5 | 40/50 |
| TR-3 | 1,600 | 125 | 50 |
| QIC-3080 | 1,200-1,600 | 125 | 60/72 |
| TR-4 | 4,000 | 1024 | 72 |
| QIC-3095 | 4,000 | 1024 | 72 |
| TR-5 | 10,000 | 1024 | 108 |
SLR
Main articles: Scalable Linear Recording
SLR is Tandberg Data's name for its line of high-capacity QIC data cartridge drives. As of 2005, Tandberg was the only manufacturer of SLR/QIC drives in the world. The largest SLR drive can hold 70 GB of data (140 GB compressed).
QIC-Wide
A variant from Sony that uses a wider .315 inch (8 mm) tape and increases the recording density. QIC wide drives are backwards compatible with QIC tapes.
QIC-EX
''QIC Extra'', a modification to support a longer tapes, and thus more data by the Verbatim Corporation, this was made possible by making the cartridges physically longer.
QIC-157
An interface standard for tape drives using the ATAPI (IDE) interface.
External links
★ The QIC international trade organisation
★ List of different QIC formats
★ Useful details of earliest QIC-11 and QIC-24 formats
★ Introduction to QIC tape drives
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