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-E258

5-11

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Image 87
Fujitsu MHW2040AC, MHW2060AC Device/Head register X’1F6’, DEV HS3 HS2 HS1 HS0, Status register X’1F7’, Bsy, Dsc Drq Err
Page 86 Page 88

MHW2060AC, MHW2040AC specifications

The Fujitsu MHW2040AC and MHW2060AC are notable hard disk drives (HDDs) that have been widely used in various computing applications, especially in laptops and compact devices. These models are part of Fujitsu's commitment to providing reliable storage solutions that meet the demands of modern computing.

The MHW2040AC offers a storage capacity of 40 GB, while the MHW2060AC provides a slightly larger capacity at 60 GB. This range of storage makes both models suitable for users looking for dependable space for documents, multimedia files, and software applications. Both drives utilize a 2.5-inch form factor, ideal for mobile computing, as they are lightweight and designed to fit into space-constrained environments.

In terms of performance, both drives operate at a spindle speed of 5400 RPM. This speed strikes a balance between power consumption and performance, making these drives an efficient choice for everyday tasks, such as web browsing and office applications. The drives are equipped with an interface of Ultra ATA/133, which enables faster data transfer rates compared to older models, thereby enhancing overall system responsiveness.

The MHW2040AC and MHW2060AC also incorporate several advanced technologies to bolster their performance and reliability. One such feature is the use of a fluid dynamic bearing (FDB) for the spindle motor, which minimizes noise and vibration, thus improving the overall user experience. Additionally, both drives come with error correction technology that helps maintain data integrity by detecting and correcting errors during read and write operations.

Moreover, these HDDs feature a shock sensor that can detect sudden movements, allowing the drive to park its heads to prevent data loss and hardware damage. This is particularly beneficial in mobile environments where the risks of impact are higher.

Both the MHW2040AC and MHW2060AC are designed with energy-saving features, making them an environmentally responsible choice for energy-conscious consumers. Their low power consumption not only contributes to a reduced carbon footprint but also extends battery life for portable devices.

In summary, the Fujitsu MHW2040AC and MHW2060AC are reliable, efficient, and user-friendly hard disk drives that combine moderate capacities with advanced features designed to enhance performance, ensure data integrity, and extend device longevity. These drives are well-suited for a range of applications, making them a solid choice for users seeking dependable storage solutions.
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