5.4 Command Protocol

Figure 5.6 Protocol for the command execution without data transfer

5.4.4 Other commands

•

•

•

READ MULTIPLE (EXT)

WRITE MULTIPLE (EXT/FUA EXT)

SLEEP

See the description of each command.

5.4.5 DMA data transfer commands

•

•

•

READ DMA (EXT)

WRITE DMA (EXT/FUA EXT)

INDENTIFY DEVICE DMA

Starting the DMA transfer command is the same as the READ SECTOR(S) or WRITE SECTOR(S) command except the point that the host initializes the DMA channel preceding the command issuance.

Interruption processing for DMA transfer does not issue interruptions in any intermediate sector when a multisector command is executed.

The following outlines the protocol:

The interrupt processing for the DMA transfer differs the following point.

•The interrupt processing for the DMA transfer differs the following point.

a)The host writes any parameters to the Features, Sector Count, Sector Number, Cylinder, and Device/Head register.

b)The host initializes the DMA channel

c)The host writes a command code in the Command register.

d)The device sets the BSY bit of the Status register.

e)The device asserts the DMARQ signal after completing the preparation of data transfer. The device asserts either the BSY bit or DRQ bit during DMA data transfer.

C141-E258

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Fujitsu MHW2040AC manual Other commands, DMA data transfer commands, Read Multiple EXT Write Multiple EXT/FUA EXT Sleep
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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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