Seek time, Time to ready, Power specifications

2.7Seek time

Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications in the table below are defined as follows:

•Track-to-track seek time is an average of all possible single-track seeks in both directions.

•Average seek time is a true statistical random average of at least 5,000 measurements of seeks between random tracks, less overhead.

Table 2:	Typical seek times

Typical seek times (msec)		Read	Write

Track-to-track		1.0	1.5

Average		11.0	13.0

Full-stroke		22.0	24.0

Average latency		5.56	5.56

Note. These drives are designed to consistently meet the seek times represented in this manual. Physical seeks, regardless of mode (such as track-to-track and average), are expected to meet the noted values. However, due to the manner in which these drives are formatted, benchmark tests that include command overhead or measure logical seeks may produce results that vary from these specifications.

2.8Time to ready

Time to ready	Typical	Max @ 25°C

Power-on to Ready (sec)	3.5	8.0

Standby to Ready (sec)	3.0	8.0

2.9Power specifications

The drive receives DC power (+5V) through a native SATA power connector.

2.9.1Power consumption

Power requirements for the drives are listed in the table on page 7. Typical power measurements are based on an average of drives tested, under nominal conditions, at 25°C ambient temperature, after 25 minutes of oper- ation.

•Spinup power

Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed.

•Seek mode

During seek mode, the read/write actuator arm moves toward a specific position on the disc surface and does not execute a read or write operation. Servo electronics are active. Seek mode power is measured based on three random seek operations every 100 msecs. This mode is not typical.

•Read/write power and current

Read/write power is measured with the heads on track, based on three 63 sector read or write operations every 100 msecs.

Momentus 5400.3 SATA Blade Server Product Manual, Rev. E

ST9402116SB, ST980815SB, ST9160821SB, ST9100828SB, ST9120822SB specifications

The Seagate ST980815SB, ST9120822SB, ST9402116SB, ST9160821SB, and ST9100828SB are a lineup of popular hard disk drives that cater to various data storage needs, especially in enterprise and server environments. Each model features a combination of cutting-edge technology, performance capabilities, and robust reliability, making them ideal choices for businesses and IT infrastructures.

The ST980815SB, with a capacity of 80GB, was designed to meet the requirements of entry-level servers, workstations, and embedded applications. It operates at a spindle speed of 7200 RPM, ensuring quick access to stored data. This model employs the use of perpendicular magnetic recording technology, which enhances data density and reliability, allowing for increased storage capacity in a compact form factor.

The ST9120822SB offers a larger storage capacity of 120GB, targeting small to mid-sized enterprise applications. Like its smaller counterpart, it operates at 7200 RPM, delivering high transfer rates and low latency, which are critical for data-intensive operations. It includes features such as Native Command Queuing (NCQ) that optimizes the order of read and write commands, enhancing overall performance during multi-tasking operations.

Next in line, the ST9402116SB provides an impressive 400GB of storage, catering to applications that require a substantial amount of capacity. This model also uses a 7200 RPM spindle speed and incorporates SATA interface technology, providing fast data transfer rates while ensuring seamless integration into existing systems. Its robust design makes it suitable for continuous operation in always-on environments.

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