7K200 SATA OEM Specification

5 Data integrity

5.1Data loss on power off

Data loss will not be caused by a power off during any operation except the write operation.

A power off during a write operation causes the loss of any received or resident data that has not been written onto the disk media.

A power off during a write operation might make a maximum of one sector of data unreadable. This state can be recovered by a rewrite operation.

5.2Write Cache

When the write cache is enabled, the write command may complete before the actual disk write operation finishes. This means that a power off, even after the write command completion, could cause the loss of data that the drive has received but not yet written onto the disk.

In order to prevent this data loss, confirm the completion of the actual write operation prior to the power off by issuing a

Soft reset

COMRESET

Flush Cache command

Standby command

Standby Immediate command

Sleep command

Confirm the command’s completion.

5.3Equipment status

The equipment status is available to the host system any time the drive is not ready to read, write, or seek. This status normally exists at the power-on time and will be maintained until the following conditions are satisfied:

The access recalibration/tuning is complete.

The spindle speed meets the requirements for reliable operation. The self-check of the drive is complete.

The appropriate error status is made available to the host system if any of the following conditions occur after the drive has become ready:

The spindle speed lies outside the requirements for reliable operation. The occurrence of a Write Fault condition.

5.4WRITE safety

The drive ensures that the data is written into the disk media properly. The following conditions are monitored during a write operation. When one of these conditions exceeds the criteria, the write operation is terminated and the automatic retry sequence is invoked.

Head off track External shock Low supply voltage

Spindle speed out of tolerance Head open/short

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Hitachi HDS723020BLA642 manual Data integrity, Data loss on power off, Write Cache, Equipment status, Write safety
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HDS723020BLA642 specifications

The Hitachi HDS723020BLA642 is a high-performance hard disk drive that exemplifies the balance between reliability and advanced technology, making it an excellent choice for a range of applications, from desktop computers to enterprise storage solutions. This 2TB SATA hard drive is designed to meet the growing data storage needs of users who demand both speed and efficiency.

One of the key features of the HDS723020BLA642 is its impressive rotational speed of 7200 RPM. This speed facilitates faster data access and improved overall performance, significantly enhancing the user experience during data-intensive operations such as gaming, video editing, and large file transfers. Coupled with a SATA III interface, this drive facilitates data transfer rates of up to 6 Gb/s, providing an efficient conduit for moving data quickly between the hard drive and the motherboard.

The drive comes equipped with a large 64 MB cache, which plays a crucial role in buffering read and write operations. This substantial amount of cache memory allows the drive to temporarily store frequently accessed data, leading to reduced latency and enabling smoother multitasking capabilities. Users will benefit from faster load times and reduced wait periods when working with large files.

Reliability is another defining characteristic of the HDS723020BLA642. Hitachi, now a part of Western Digital, has a longstanding reputation for producing durable hard drives. This model incorporates advanced technologies, such as the Fluid Dynamic Bearing (FDB) for quieter operation and better longevity. The drive also features an enhanced error recovery system that minimizes the risk of data loss, making it a suitable option for both personal and professional use.

In terms of power efficiency, the HDS723020BLA642 is designed to consume less power during operation compared to older hard drive models. This efficiency not only helps in reducing operational costs but also contributes to a longer lifespan for the drive itself.

Overall, the Hitachi HDS723020BLA642 hard drive combines speed, reliability, and efficiency into a compact package, making it an ideal choice for users needing a substantial amount of storage without compromising on performance. Whether for upgrading an existing system or building a new one, this drive offers a blend of technology and durability that caters to modern storage demands.
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