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Term
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Description
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Landing Zone, LZONE OR LZ
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Also known as the parking cylinder or parking zone. A "safe" area on inside tracks of the drive where the read/write heads are moved when the power is turned off. The heads are magnetically latched when they get there (sometimes you can hear a small click). All modern IDE drives park automatically on power down so this entry is not necessary. This setting is usually set to 0. Some systems with "Auto Detect" set this to 65,535, or equal to the number of cylinders, any of these settings is fine.
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Late BIT
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A bit that is in the late half of the data window.
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Late Window
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A data window that has been shifted in a late direction to facilitate data recovery.
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Latency
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A delay encountered in a computer when waiting for a specific response. In a disk drive there is both seek latency and rotational latency. The time required for the addressed sector to arrive under the head after the head is positioned over the correct track. It is a result of the disk's rotational speed and must be considered in determining the disk drive's total access time.
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Logic
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Electronic circuitry that switches on and off ("1" and "0") to perform functions.
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Logical Address
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A storage location address that may not relate directly to a physical location. Usually used to request information from a controller, which performs a logical to physical address conversion, and in turn, retrieves the data from a physical location in the mass storage peripheral.
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Logical Block Addressing (LBA)
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Defines the addressing of the device by the linear mapping of sectors. The Logical Block Address (LBA) mode can only be utilized in systems that support this form of translation. The Cylinder, Head and Sector (CHS) geometry of the drive, as presented to the host, differs from the actual physical geometry.
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Logical Sector
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The lowest unit of space that DOS can access through a device driver; one or more physical sectors.
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Low Frequency
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The lowest recording frequency used in a particular magnetic recording device. With FM or MFM channel codes this frequency is also called "IF".
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