Logical Block Addressing, Software ECC Correction

PRODUCTDESCRIPTION

Logical Block Addressing

The Logical Block Address (LBA) mode can only be utilized in systems that support this form of translation. The cylinder, head and sector geometry of the drive, as presented to the host, differs from the actual physical geometry. The host AT computer may access a drive of set parameters: number of cylinders, heads and sectors per track, plus cylinder, head and sector addresses. However, the drive can’t use these host parameters directly because of zoned recording techniques. The drive translates the host parameters to a set of logical internal addresses for data access.

The host drive geometry parameters are mapped into an LBA based on this formula:

LBA	=	(HSCA - 1) + HHDA x HSPT + HNHD x HSPT x HCYA	(1)
	=	(HSCA - 1) + HSPT x (HHDA + HNHD x HCYA)	(2)
where	HSCA = Host Sector Address, HHDA = Host Head Address
	HCYA = Host Cylinder Address, HNHD = Host Number of Heads
	HSPT = Host Sectors per Track

The LBA is checked for violating the drive capacity. If it does not, the LBA is converted to physical drive cylinder, head and sector values. The physical address is then used to access or store the data on the disk and for other drive related operations.

Defect Management Zone (DMZ)

Each drive model has a fixed number of spare sectors per drive, all of which are located at the end of the drive. Upon detection of a bad sector that has been reassigned, the next sequential sector is used.

For example, if sector 3 is flagged, data that would have been stored there is “pushed down” and recorded in sector 4. Sector 4 then effectively becomes sector 3, as sequential sectors are “pushed down” across the entire drive. The first spare sector makes up for the loss of sector 3, and so maintains the sequential order of data. This push down method assures maximum performance.

On-the-Fly Hardware Error Correction Code (ECC)

33 bits, single burst, guaranteed

Software ECC Correction

81 bits, single burst, guaranteed

33 bits, double bursts, guaranteed

Automatic Park and Lock Operation

Immediately following power down, dynamic braking of the spinning disks delays momentarily allowing the read/write heads to move to an inner mechanical stop. A small fixed magnet holds the rotary actuator in place as the disk spins down. The rotary actuator is released only when power is again applied.

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91152D8, 90845D6, 90648D5, 90720D5, 90510D4 specifications

Maxtor, a prominent name in the storage device industry, has developed a series of hard disk drives that cater to various computing needs. Among their lineup, models like the 90720D5, 90648D5, 90840D6, 91152D8, and 90432D3 stand out due to their distinctive features, technologies, and characteristics, making them suitable for both everyday computing and intensive data storage tasks.

The Maxtor 90720D5 is revered for its exceptional storage capacity of 72 GB, providing ample space for users to store a wide variety of files, from documents to multimedia content. This model operates with a spindle speed of 5400 RPM, allowing for a good balance between performance and power consumption, making it ideal for desktop and general-purpose usage.

Moving on to the Maxtor 90648D5, this model boasts a similar spindle speed but offers a larger capacity of 64 GB. With its advanced data integrity features, the 90648D5 utilizes error correction codes to ensure the reliable storage of important files, thus minimizing the risks of data loss.

The Maxtor 90840D6 represents a significant upgrade in terms of performance and capacity. With a storage capability of 80 GB, this drive is designed for users who require more space along with improved read and write speeds. The 90840D6 employs a sophisticated read/write head technology that enhances data retrieval times, ultimately improving overall system responsiveness.

The Maxtor 91152D8 further pushes the boundaries with a sizable 115 GB storage capacity. This model is well-equipped for handling large files, making it a preferred choice for video editing and other data-intensive applications. Additionally, it integrates advanced thermal management technologies to ensure optimal operating temperatures, thus enhancing longevity and reliability.

Finally, the Maxtor 90432D3 serves as a versatile option with a capacity of 43 GB. Recognizing the growing need for efficient storage solutions, this model focuses on providing users with a balance of performance and affordability, appealing to budget-conscious consumers without sacrificing quality.

In summary, the Maxtor 90720D5, 90648D5, 90840D6, 91152D8, and 90432D3 present a comprehensive range of hard disk drives that cater to diverse user requirements. Each model features unique capacities and advanced technologies, ensuring an efficient storage solution that adequately supports both casual users and professionals.