5.3 Host Commands

Multiword DMA transfer mode X

00100 000 (X’20’: Mode 0)

 

00100 001 (X’21’: Mode 1)

 

00100 010 (X’22’: Mode 2)

Ultra DMA transfer mode X

01000 000 (X’40’: Mode 0)

 

01000 001 (X’41’: Mode 1)

 

01000 010 (X’42’: Mode 2)

 

01000 011 (X’43’: Mode 3)

 

01000 100 (X’44’: Mode 4)

 

01000 101 (X’45’: Mode 5)

*2) Advanced Power Management (APM)

The host writes the Sector Count register with the desired power management level and executes this command with the Features register X’05’, and then Advanced Power Management is enabled.

The drive automatically shifts to power saving mode up to the specified APM level when the drive does not receive any commands for a specific time. The sequence in which the power management level shifts is from Active Idle to Low Power Idle to Standby. The Mode-2 level requires the longest shifting time, depending on the APM level settings. The settings of the APM level revert to their default values (Mode-1) when power-on or a hardware reset occurs for the drive.

 

APM Level

Sector Count Register

 

 

Mode 0 Active Idle → Low Power Idle

C0h-FEh

Mode 1 Active Idle → Low Power Idle

80h-BFh

Mode 2 Active Idle → Low Power Idle

01h-7Fh

Reserve (State Keep)

00h, FFh

 

 

 

Active Idle:

The spindle motor rotates, and the head is loaded on

 

the most inner position on media.

Low Power Idle: The spindle motor rotates, and the head is unloaded.

Standby:

The spindle motor stops, and the head is unloaded.

C141-E221

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Fujitsu MHV2040AS, MHV2080AS, MHV2060AS manual Advanced Power Management APM
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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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