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Fujitsu MHW2060AC, MHW2040AC manual Execution timing of self-calibration

Models: MHW2060AC MHW2040AC

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Theory of Device Operation

4.5.2 Execution timing of self-calibration

Self-calibration is performed once when power is turned on. After that, the disk drive does not perform self-calibration until it detects an error.

That is, self-calibration is performed each time one of the following events occur:

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In the case that the disk drive starts up normally, the first part of self- calibration starts after a lapse of 100 msec. The execution of first part is about 150 msec. length. The remains is executed thereafter the transfer to Active- Idle state which takes about 200 msec.

The latter is interrupted when the disk drive receives a Host command, and it resumes after next transfer to Active-Idle state.

The number of retries to write or seek data reaches the specified value.

The error rate of data reading, writing, or seeking becomes lower than the specified value.

4.5.3 Command processing during self-calibration

This enables the host to execute the command without waiting for a long time, even when the disk drive is performing self-calibration. The command execution wait time is about maximum 72 ms.

When the error rate of data reading, writing, or seeking becomes lower than the specified value, self-calibration is performed to maintain disk drive stability.

If the disk drive receives a command execution request from the host while performing self-calibration, it stops the self-calibration and starts to execute the command. In other words, if a disk read or write service is necessary, the disk drive positions the head to the track requested by the host, reads or writes data, and then restarts calibration after about 3 seconds.

If the error rate recovers to a value exceeding the specified value, self-calibration is not performed.

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Fujitsu MHW2060AC, MHW2040AC manual Execution timing of self-calibration, Command processing during self-calibration
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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.