INTERFACE COMMANDS

ReadCommands

Read Sector(s)

Reads from 1 to 256 sectors, as specified in the Command Block, beginning at the specified sector. (A sector count of 0 requests 256 sectors.) Immediately after the Command register is written, the drive sets the BSY bit and begins execution of the command. If the drive is not already on the desired track, an implied seek is performed.

Once at the desired track, the drive searches for the data address mark of the requested sector. The data address mark must be recognized within a specified number of bytes, or the Data Address Mark Not Found error will be reported. Assuming the data address mark is found:

1.The data field is read into the sector buffer.

2.Error bits are set (if an error was encountered).

3.The DRQ bit is set.

4.An interrupt is generated.

The DRQ bit is always set, regardless of the presence or absence of an error condition after the sector. Upon command completion, the Command Block registers contain the numbers of the cylinder, head and sector of the last sector read. Back-to-back sector read commands set DRQ and generate an interrupt when the sector buffer is filled at the completion of each sector. The drive is then ready for the data to be read by the host. DRQ is reset and BSY is set immediately when the host empties the sector buffer.

If an error occurs during Read Sector commands, the read terminates at the sector where the error occurred. The host may then read the Command Block to determine the nature of that error, and the sector where it happened. If the error type is a correctable or an non-correctable data error, the flawed data is loaded into the sector buffer.

A Read Long command sets the Long bit in the command code and returns the data and the ECC bytes in the data field of the specified sector. During a Read Long, the drive does not check the ECC bytes to determine if there has been a data error. The Read Long command is limited to single sector requests.

Read Verify Sector(s)

Identical to the Read Sector(s) command, except that:

1.DRQ is never set,

2.No data is transferred back to the host and

3.The long bit is not valid.

7 – 2

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Maxtor 96147H6, 98196H8 specifications ReadCommands
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96147H6, 98196H8 specifications

The Maxtor 98196H8 and 96147H6 are notable hard drive models that were part of Maxtor's diverse range of storage solutions. Both models were designed to cater to various computing needs and display characteristics that made them reliable, high-performance options during their time in the market.

The Maxtor 98196H8 is a 19.1 GB hard drive that utilizes the IDE interface, which is known for its ease of use and compatibility with a broad range of motherboards. This model features a rotational speed of 5400 RPM, striking a balance between performance and power consumption. With a data transfer rate of up to 33 MB/s, the 98196H8 is capable of efficiently handling average workloads, making it suitable for everyday computing tasks such as word processing, web browsing, and media playback.

One standout characteristic of the 98196H8 is its shock protection technology, which enhances durability and reduces the risk of data loss from accidental drops. The drive uses fluid dynamic bearing (FDB) motors for quieter operation and increased reliability. Additionally, Maxtor's proprietary technology, including the SoftSonic feature, allows for reduced operational noise levels, making it an appealing choice for users who prioritize a quiet working environment.

On the other hand, the Maxtor 96147H6 boasts a slightly larger capacity of 14.7 GB and shares similar interface traits and rotational speed as the 98196H8. With a focus on providing reliable storage for desktop applications, this model leverages Maxtor's advanced data recovery solutions, which help ensure that users can restore lost data in the event of drive failures. Its high-capacity storage makes it well-suited for users dealing with larger files or needing additional space for various applications and media.

Both models are equipped with Maxtor's Error Recovery Control technology, which actively manages potential read/write errors, ensuring data integrity during storage and retrieval processes. This is especially beneficial for users handling critical information or relying on the storage for important projects.

In conclusion, the Maxtor 98196H8 and 96147H6 hard drives exemplified Maxtor's dedication to creating dependable storage solutions for consumers. With their variety of capacities, advanced technologies, and characteristics tailored to improve reliability and performance, they served many users well during their availability in the market.
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