SCSI Commands

5.1.6Behavior at Power-On and SCSI Bus Reset

The following apply to the DLT 7000 system tape drive’s behavior at power-on and/or SCSI bus reset:

∙When the Quantum DLT 7000 system is powered up, all device SCSI lines are set to high impedance.

∙The design of the DLT 7000 system tape drive does not allow it to generate any spurious signals on the SCSI bus at power-on.

∙Within five seconds of power-on, and within 250 milliseconds (typically under 4 milliseconds) after a SCSI bus reset, the DLT 7000 system tape drive responds to SCSI bus selections and returns appropriate, normal responses. Tape motion commands will be returned with Check Condition status, Sense Key Not Ready, until the tape medium has been made ready.

∙The tape drive implements the hard bus reset option.

∙The tape medium is rewound to Beginning of Tape (BOT).

The DLT 7000 system tape drive recognizes multiple, successive SCSI bus resets and SCSI bus resets of arbitrarily long duration. The tape drive recovers within the time limits specified above following the last SCSI bus reset.

The tape drive goes through a calibration process at power up and loading of medium.

5.1.7Data Cache and Tape Write Interaction

The Quantum DLT 7000 system tape drive contains a data cache that buffers blocks (records) until they are written to tape. This section describes when those blocks are written, or “flushed” to tape. A Mode Select parameter allows the data cache to be disabled (unbuffered mode). In this mode, every WRITE command causes data to be written to the tape medium before the STATUS byte and the COMMAND COMPLETE message are returned to the host.

NOTE

Unbuffered mode is NOT recommended due to the poor performance that may result.

The contents of the write data cache are written to the tape medium under the following circumstances:

∙When two or more WRITE FILEMARKS commands are issued without intervening tape motion commands.

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Behavior at Power-On and Scsi Bus Reset, Data Cache and Tape Write Interaction
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DLT 7000 specifications

The Quantum Instruments DLT 7000 is a state-of-the-art battery-powered light that brings advanced photography and videography offerings to professionals and enthusiasts alike. Renowned for its compact design, the DLT 7000 combines lightweight portability with powerful functionality. It is engineered to enhance the creative process by providing optimal lighting solutions in a variety of settings.

One of the standout features of the DLT 7000 is its innovative LED technology. This light source offers consistency in color temperature and output, ensuring high-quality illumination for both photo and video applications. The unit boasts an impressive color accuracy with a CRI (Color Rendering Index) rating that exceeds 90, making it ideal for capturing true-to-life colors in any situation. The DLT 7000 allows users to adjust the color temperature from a warm 3200K to a cool 5600K, catering to different lighting needs and environments.

Moreover, the DLT 7000 features a dimming function that allows for seamless adjustments from 0 to 100% brightness. This level of control not only aids in achieving the perfect exposure but also helps in creating the desired mood or atmosphere for a shot. The robust design of the DLT 7000 includes durable construction material that can withstand the rigors of location shoots, making it a reliable tool for professionals.

In addition to its lighting capabilities, the DLT 7000 incorporates smart technology. It is equipped with a built-in wireless control system that allows users to adjust settings from a distance, promoting flexibility during shoots. This wireless functionality extends to multiple units, enabling synchronized lighting setups for complex scenes.

Another notable characteristic of the DLT 7000 is its versatile power options. The light can operate on lithium-ion batteries, ensuring long-lasting performance during extended shoots without the constraint of power outlets. There is also an option for AC power, providing users flexibility in various shooting locations.

In summary, the Quantum Instruments DLT 7000 stands out with its combination of advanced LED technology, adjustable color temperatures, built-in dimming capabilities, and smart wireless controls. Whether for professional photography or videography, this light is designed to meet the demands of the most discerning artists, making it an essential addition to any lighting kit.
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