Từ Điển Anh Việt "Tape Drive"


What is a tape drive?

A tape drive is a device that stores computer data on magnetic tape, especially for backup & archiving purposes. Lượt thích an ordinary tape recorder, a tape drive records data on a loop of flexible celluloidlike material that can be read and also erased.

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Tape drives work either by using a traditional helical scan where the recording & playback heads cảm biến the tape, or linear tape technology, where the heads never actually cảm biến the tape. Drives can be rewinding, where the device issues a rewind command at the end of a session, or non-rewinding.

Rewinding devices are commonly used when a tape must be unmounted at the end of a session after batch processing large amounts of data. Payroll is the classic example of this use. Non-rewinding devices are useful for incremental tape backups và other applications where new files are added khổng lồ the kết thúc of the previous session"s files.

Tape drives differ from hard disk drives (HDDs) và solid-state drives (SSDs) in the way data is read và written khổng lồ the storage media. Tapes store data sequentially, whereas HDDs and SSDs use rotating disks with rapidly moving seek heads, nonmoving flash memory or similar giải pháp công nghệ to transfer data.

Drives come in many sizes and capabilities. They are sold as standalone units or stacked in data center racks, creating tape libraries. The tapes themselves are often housed in sealed cassettes that can be inserted into the drive và activated.

Spectra Logic"s LTO-8 tape & tape drive

Strengths và limitations of tape drives

There are several benefits lớn using tape drives, particularly for backup and archival uses. They include the following:

Capacity. Tapes have a large capacity for storing data when compared lớn HDDs. Low cost. They are economical when compared khổng lồ other storage media. Transportable. Tapes can be easily moved from one location lớn another và are considered off-line storage.

Some drawbacks of tape giải pháp công nghệ include the following:

Sequential storage. Tape drives use a sequential access approach lớn reading and writing data. That means they must start at the beginning of the tape and roll through it lớn access specific data or write new data.
See an automated tape library in operation.

What are the primary tape drive technologies?

Tape systems access data sequentially. In the early years, that factor resulted in slower read/write speeds. Today, two primary tape technologies -- linear tape và helical scan systems -- have advanced tape performance, making it comparable to lớn disk drive systems. While these technologies have improved drive performance, they are largely incompatible with each other.

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Linear tape

Linear tape công nghệ has parallel tracks of data that extend the length of the tape. Multiple read/write heads operate in parallel, reading & writing data simultaneously. Tape cartridges consist of one tape spool. When the cartridge is inserted, the kết thúc of the tape connects into a take-up spool inside the device. Linear tape truyền thông is approximately a half-inch wide.

Helical scan

Helical scan systems write data in diagonal strips along the tape & use two tape reels in the same cartridge with a quarter inch-wide tape media. This giải pháp công nghệ provides greater data storage mật độ trùng lặp từ khóa than linear tape. However, the helical scan cartridges may store less data than linear tape models.

What tape formats are in use?

For linear tape drives, the primary format is Linear Tape-Open, which is also called LTO Ultrium. Hewlett Packard, IBM and Quantum jointly developed this format as part of the LTO Consortium. It"s an xuất hiện standard that any tape drive manufacturer can license.

Along with the LTO specification, the Linear Tape file System lets users view & access tape files the same as with disk-based truyền thông media files. LTO partitions the tape with a content index & the actual data. This arrangement speeds up the read/write capabilities of linear tape systems.

Helical scan drives are still available. However, linear tape drives have largely surpassed them in terms of performance, cost and convenience.

Evolution of tape drives

Tape drives were introduced in the early 1950s, with the emergence of data processing in the enterprise. Over the years, tape and magnetic tape have gone through many iterations to improve storage capacity and speed of access khổng lồ stored data.

Through the 1970s, these drives were manually mounted and the tape threaded through the drive components. Today, drives are more compact. They connect directly to lớn computers, storage area networks, & other devices and systems. The large reel-to-reel tape drives seen in 1950s & 1960s movies are still in use, but they are mostly for long-term archival storage.

Today, drives use sophisticated approaches that increase storage capacity into multiple terabytes & provide data transfer rates as fast as 400 megabytes per second.

Learn about the latest advances in tape technology, who is using it, what they are using it for & what"s coming next.

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