5.3 Host Commands

(19) WRITE MULTIPLE (X’C5’)

This command is similar to the WRITE SECTOR(S) command. The device does not generate interrupts (assertion of the INTRQ) signal) on each sector but on the transfer of a block which contains the number of sectors for which the number is defined by the SET MULTIPLE MODE command. The DRQ bit of the Status register is required to set only at the start of the data block, not on each sector.

The number of sectors per block is defined by a successful SET MULTIPLE MODE command. The SET MULTIPLE MODE command should be executed prior to the WRITE MULTIPLE command.

If the number of requested sectors is not divided evenly (having the same number of sectors [block count]), as many full blocks as possible are transferred, then a final partial block is transferred. The number of sectors in the partial block to be transferred is n where n = remainder of (“number of sectors”/”block count”).

If the WRITE MULTIPLE command is issued before the SET MULTIPLE MODE command is executed or when WRITE MULTIPLE command is disabled, the device rejects the WRITE MULTIPLE command with an ABORTED COMMAND error.

Disk errors encountered during execution of the WRITE MULTIPLE command are posted after attempting to write the block or the partial block that was transferred. Write operation ends at the sector where the error was encountered even if the sector is in the middle of a block. If an error occurs, the subsequent block shall not be transferred. Interrupts are generated when the DRQ bit of the Status register is set at the beginning of each block or partial block.

The contents of the command block registers related to addresses after the transfer of a data block containing an erred sector are undefined. To obtain a valid error information, the host should retry data transfer as an individual request.

At command issuance (I/O registers setting contents)

1F7H(CM)

1

1

0

0

0

1

0

1

1F6H(DH)

x

L

x

DV

Start head No. / LBA

 

 

 

 

 

 

[MSB]

 

 

 

 

 

 

 

 

 

 

 

 

1F5H(CH)

Start cylinder No. [MSB] / LBA

 

 

 

1F4H(CL)

Start cylinder No. [LSB] / LBA

 

 

 

1F3H(SN)

Start sector No. / LBA [LSB]

 

 

 

1F2H(SC)

Transfer sector count

 

 

 

 

1F1H(FR)

xx

 

 

 

 

 

 

 

C141-E258

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Fujitsu MHW2040AC, MHW2060AC manual Write Multiple X’C5’
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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.

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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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