6.3 Defect Processing

(3) Automatic alternating processing

This technology assigns a defective sector to a spare sector of a spare cylinder for alternate assignment.

This device performs automatic alternating processing in the event of any of the following errors.

•

•

Automatic alternating processing is attempted for read error recovery by reaching the specified retry cycle while a read error retry is in progress.

Before attempting automatic alternating processing, writing and reading of already corrected data is repeated for the sector in which an error occurred. If a read error does not occur during this reading operation, automatic alternating processing is not performed.

If error recovery is not successful even if a write fault error retry is executed, automatic alternating processing is performed.

Figure 6.6 shows an example where automatic alternating processing is applied to sector (physical) 5 with cylinder 0 and head 0.

Sector (physical)

Cylinder 0

Head 0

Alternate cylinder 0

Head 0

Already assigned

779 780

Defec- tive sector

(Not used)

 

779

780

This is assigned to an unassigned sector.

Notes:

1.The alternate cylinder is assigned to an inner cylinder in each zone.

2.When an access request for sector 5 is issued, the sector assigned for alternating processing of the alternate cylinder must be accessed instead of physical sector 5.

If an access request for sectors after sector 5 is issued, seek is executed to cylinder 0, head 0 in order to continue processing.

Figure 6.6 Automatic alternating processing

C141-E258

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Fujitsu MHW2040AC, MHW2060AC manual Automatic alternating processing
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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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