Interface

-Bit 7: Busy (BSY) bit. This bit is set whenever the Command register is accessed. Then this bit is cleared when the command is completed. However, even if a command is being executed, this bit is 0 while data transfer is being requested (DRQ bit = 1). When BSY bit is 1, the host system should not write the command block registers. If the host system reads any command block register when BSY bit is 1, the contents of the Status register are posted. This bit is set by the device under following conditions:

(a)Within 400 ns after RESET- is negated or SRST is set in the Device Control register, the BSY bit is set. The BSY bit is cleared, when the reset process is completed.

The BSY bit is set for no longer than 15 seconds after the IDD accepts reset.

(b)Within 400 ns from the host system starts writing to the Command register.

(c)Within 5 ∝s following transfer of 512 bytes data during execution of the READ SECTOR(S), WRITE SECTOR(S), or WRITE BUFFER command.

-Bit 6: Device Ready (DRDY) bit. This bit indicates that the device is capable to respond to a command.

The IDD checks its status when it receives a command. If an error is detected (not ready state), the IDD clears this bit to 0. This is cleared to 0 at power-on and it is cleared until the rotational speed of the spindle motor reaches the steady speed.

-Bit 5: The Device Write Fault (DF) bit. This bit indicates that a device fault (write fault) condition has been detected.

If a write fault is detected during command execution, this bit is latched and retained until the device accepts the next command or reset.

-Bit 4: Device Seek Complete (DSC) bit. This bit indicates that the device heads are positioned over a track.

In the IDD, this bit is always set to 1 after the spin-up control is completed.

-Bit 3: Data Request (DRQ) bit. This bit indicates that the device is ready to transfer data of word unit or byte unit between the host system and the device.

-Bit 2: Always 0.

-Bit 1: Always 0.

-Bit 0: Error (ERR) bit. This bit indicates that an error was detected while the previous command was being executed. The Error register indicates the additional information of the cause for the error.

5-12

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Fujitsu MHV2100AH, MHV2060AH, MHV2080AH, MHV2040AH manual Interface
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MHV2040AH, MHV2080AH, MHV2060AH, MHV2100AH specifications

The Fujitsu MHV series of hard disk drives, specifically the MHV2060AH, MHV2080AH, MHV2100AH, and MHV2040AH, are renowned for their reliability and performance in the mobile HDD segment. Designed primarily for use in laptops and other portable devices, these drives integrate cutting-edge technologies to meet the demands of today's data-intensive applications.

One of the hallmark features of the MHV series is its high data density, allowing for substantial storage capabilities in compact sizes. The MHV2060AH offers a storage capacity of 60 GB, while the MHV2080AH and MHV2100AH offer 80 GB and 100 GB respectively. The MHV2040AH provides a slightly more modest but still robust 40 GB of storage. This range of capacities ensures that users can select the model that best fits their storage needs.

The drives utilize the latest perpendicular magnetic recording (PMR) technology, which enhances recording efficiency and increases data storage densities. This technology significantly optimizes the use of disk surface area, providing better performance and more reliable data access. Additionally, the MHV series incorporates an advanced actuator system that ensures precision head positioning, enhancing data integrity and reducing error rates during read and write operations.

In terms of performance, the MHV series maintains a revolutions per minute (RPM) rating of 5400, which strikes a balance between speed and energy efficiency, making these drives suitable for low-power applications. The drives are also designed with a low acoustic level, generating minimal noise during operation—a crucial factor for mobile users who prefer quieter devices.

Furthermore, the Fujitsu MHV series features a robust shock resistance design, allowing them to withstand the rigors of mobile computing. This makes them suitable for use in portable environments subject to vibration and physical movement, thus ensuring data security and drive longevity.

Overall, the Fujitsu MHV2060AH, MHV2080AH, MHV2100AH, and MHV2040AH represent a formidable selection of mobile hard disk drives filled with advanced technologies and features, making them well-suited for a wide range of applications in today's fast-paced digital world. With their combination of storage capacity, performance, and durability, these drives continue to serve as reliable solutions for users seeking efficient data storage in portable formats.
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