5.2 Logical Interface

(8) Device/Head register (X’1F6’)

The contents of this register indicate the device and the head number.

When executing INITIALIZE DEVICE PARAMETERS command, the contents of this register defines “the number of heads minus 1” (a maximum head No.).

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

 

 

 

 

 

 

 

 

X

L

X

DEV

HS3

HS2

HS1

HS0

 

 

 

 

 

 

 

 

-Bit 7: Unused

-Bit 6: L. 0 for CHS mode and 1 for LBA mode.

-Bit 5: Unused

-Bit 4: DEV bit. 0 for the master device and 1 for the slave device.

-Bit 3: HS3 CHS mode head address 3 (23). bit 27 for LBA mode. Unused under the LBA mode of the EXT command.

-Bit 2: HS2 CHS mode head address 2 (22). bit 26 for LBA mode. Unused under the LBA mode of the EXT command.

-Bit 1: HS1 CHS mode head address 1 (21). bit 25 for LBA mode. Unused under the LBA mode of the EXT command.

-Bit 0: HS0 CHS mode head address 0 (20). bit 24 for LBA mode. Unused under the LBA mode of the EXT command.

(9)Status register (X’1F7’)

The contents of this register indicate the status of the device. The contents of this register are updated at the completion of each command. When the BSY bit is cleared, other bits in this register should be validated within 400 ns. When the BSY bit is 1, other bits of this register are invalid. When the host system reads this register while an interrupt is pending, it is considered to be the Interrupt Acknowledge (the host system acknowledges the interrupt). Any pending interrupt is cleared (negating INTRQ signal) whenever this register is read.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit

2

Bit

1

Bit 0

 

 

 

 

 

 

 

 

 

 

BSY

DRDY

DF

DSC

DRQ

0

 

0

 

ERR

 

 

 

 

 

 

 

 

 

 

C141-E221

5-11

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Image 87
Fujitsu MHV2080AS, MHV2060AS Device/Head register X’1F6’, DEV HS3 HS2 HS1 HS0, Status register X’1F7’, Bsy, Dsc Drq Err
Page 86 Page 88

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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