Interface

-Bit 7: Busy (BSY) bit. This bit is set whenever the Command register is accessed. Then this bit is cleared when the command is completed. However, even if a command is being executed, this bit is 0 while data transfer is being requested (DRQ bit = 1). When BSY bit is 1, the host system should not write the command block registers. If the host system reads any command block register when BSY bit is 1, the contents of the Status register are posted. This bit is set by the device under following conditions:

(a)Within 400 ns after RESET- is negated or SRST is set in the Device Control register, the BSY bit is set. The BSY bit is cleared, when the reset process is completed.

The BSY bit is set for no longer than 15 seconds after the IDD accepts reset.

(b)Within 400 ns from the host system starts writing to the Command register.

(c)Within 5 ∝s following transfer of 512 bytes data during execution of the READ SECTOR(S), WRITE SECTOR(S), or WRITE BUFFER command.

-Bit 6: Device Ready (DRDY) bit. This bit indicates that the device is capable to respond to a command.

The IDD checks its status when it receives a command. If an error is detected (not ready state), the IDD clears this bit to 0. This is cleared to 0 at power-on and it is cleared until the rotational speed of the spindle motor reaches the steady speed.

-Bit 5: The Device Write Fault (DF) bit. This bit indicates that a device fault (write fault) condition has been detected.

If a write fault is detected during command execution, this bit is latched and retained until the device accepts the next command or reset.

-Bit 4: Device Seek Complete (DSC) bit. This bit indicates that the device heads are positioned over a track.

In the IDD, this bit is always set to 1 after the spin-up control is completed.

-Bit 3: Data Request (DRQ) bit. This bit indicates that the device is ready to transfer data of word unit or byte unit between the host system and the device.

-Bit 2: Always 0.

-Bit 1: Always 0.

-Bit 0: Error (ERR) bit. This bit indicates that an error was detected while the previous command was being executed. The Error register indicates the additional information of the cause for the error.

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Fujitsu MHV2060AS, MHV2080AS, MHV2040AS manual Interface
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MHV2060AS, MHV2080AS, MHV2040AS specifications

Fujitsu's MHV series of hard disk drives, specifically the MHV2040AS, MHV2080AS, and MHV2060AS models, are designed to deliver efficient performance and reliability for a range of applications, particularly in desktop computing and entry-level servers. Each of these drives adheres to the Serial ATA (SATA) interface, which ensures compatibility across a wide range of systems and is known for its cost-effectiveness and simplicity.

The MHV2040AS features a storage capacity of 40GB, making it suitable for basic computing tasks including document editing, web browsing, and media playback. The MHV2060AS steps it up with a 60GB capacity, allowing for increased data storage needs while still maintaining a high level of performance. The largest of the trio, the MHV2080AS, offers an impressive 80GB of space, positioning it well for users who require additional room for applications, games, and multimedia files.

All drives in this series are equipped with a rotational speed of 5400 RPM, which strikes a balance between speed and power consumption. This speed is adequate for everyday tasks and allows for quick boot times and file access, making them ideal for home and small office environments. Additionally, the drives feature an average latency of 5.5 milliseconds, contributing to their overall performance in retrieving data.

In terms of technology, the MHV series employs a fluid dynamic bearing (FDB) motor, which not only enhances reliability but also reduces noise levels during operation. The FDB technology helps improve the longevity of the drives by minimizing wear on mechanical components. This characteristic is particularly important for users seeking quieter drives, especially in work environments that require minimal disruption.

The drives also incorporate advanced power management features that significantly reduce power consumption, making them an environmentally friendly choice for users mindful of their carbon footprint. These drives are equipped with energy-saving modes that optimize their performance when not in full use, ensuring lower operational costs and longer lifespan.

Overall, the Fujitsu MHV2040AS, MHV2080AS, and MHV2060AS hard drives provide a solid solution for users looking for dependable storage with a range of capacities to fit their needs. Their performance, combined with noise reduction technologies and energy efficiency, makes them a notable choice for various computing environments, from single-user desktops to small business applications.
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