Hitachi America Introduces Very High Capacity 2.5-Inch Disk Drive for Notebook Computers.BRISBANE Brisbane (brĭz`bən), city (1991 pop. 1,145,537), capital of Queensland, E Australia, on the Brisbane River above its mouth on Moreton Bay. , Calif.--(BUSINESS WIRE)--May 13, 1998-- Company's First Drive To Use Giant Magneto-Resistive Head Technology Achieves Areal Density The number of bits per square inch of storage surface. It typically refers to disk drives, where the number of bits per inch (bpi) times the number of tracks per inch (tpi) yields the areal density. of 3.9 Gb/sq in., Total Capacity of 6.48 GB Hitachi Hitachi (hētä`chē), city (1990 pop. 202,141), Ibaraki prefecture, E central Honshu, Japan, on the Kashima Sea. The city is a leading producer of Japan's electrical equipment. America, Ltd., today introduced its first disk drive incorporating Giant Magneto-Resistive (GMR (Giant Magnetoresistance) See magnetoresistance. ) head technology. With an areal density of 3.9 Gigabits (Gb) per square inch, the new DK228A-65, slim profile (12.7 mm), notebook drive provides a storage capacity of 6.48 GigaBytes (GB). With the move to GMR heads in its notebook disk drive line, Hitachi affirms its position as a technology leader in this fast growing segment of the computer storage industry. GMR heads are more sensitive than the MR heads used by most drive manufacturers. Thus, they can read smaller bits of data on a disk surface, allowing Hitachi to increase total capacity to a record level for a slim profile, notebook drive. Hitachi develops and manufactures all key disk drive technologies, including the GMR heads, read channel electronics, and low noise recording media. The GMR heads are fabricated fab·ri·cate tr.v. fab·ri·cat·ed, fab·ri·cat·ing, fab·ri·cates 1. To make; create. 2. To construct by combining or assembling diverse, typically standardized parts: on state-of-the-art "pico" sliders sliders a species of tortoise kept as pets. They have a black shell and a red stripe behind the eye. Called also Chrysemys scripta elegans, red-eared sliders. mounted on an innovative suspension that limits shock induced induced /in·duced/ (in-dldbomacst´) 1. produced artificially. 2. produced by induction. induced, adj artificially caused to occur. induced induction. slider A block of material that holds the read/write head of a magnetic disk. See flying head. movement. The pico slider and GMR head fly above the disk surface at a height equivalent to about one-tenth the wavelength of blue light. Additionally, Hitachi developed a special magnetic material that is tolerant of severe heat conditions, providing the high reliability needed for operating a drive in the restricted area of a notebook PC. "The Giant MR heads used in Hitachi's latest notebook drive mark a major transition in technology for the mobile storage industry," said Gary Galusha, vice president of hard disk drive sales for Hitachi America's Computer Division, Storage Products Group. "The outstanding 6.4 GB capacity and performance delivered in the DK228A-64 is ideal for today's mobile applications, which increasingly must support the levels of audio and multimedia video applications used on desktop PCs or workstations." Galusha noted that the capacity of the new drive, sufficient to store up to three hours of MPEG-2 compressed video compressed video - video compression , is 30 percent greater than the capacity of industry leading models introduced by Hitachi just four months ago. The 6.48 GB, DK228-65 is a three disk and six head drive, about the size of a cassette A removable magnetic tape storage module that contains supply and takeup reels (hubs) in the same housing. Most audio tapes and videotapes use cassettes as well as backup tape technologies such as DAT, 8mm and Magstar MP (see below). tape (70 mm X 100 mm X 12.7 mm), with a weight of 130 grams. The drive has a rotational speed Rotational speed (sometimes called speed of revolution) indicates, for example, how fast a motor is running. Rotational speed is equivalent to angular speed, but with different units. Rotational speed tells how many complete rotations (i.e. of 4,200 rpm and a 512 kB data buffer In computing, a buffer is a region of memory used to temporarily hold data while it is being moved from one place to another. Typically, the data is stored in a buffer as it is retrieved from an input device (such as a keyboard) or just before it is sent to an output device (such . The performance specifications include a 12 ms average seek time and 7.1 ms average latency (1) The time between initiating a request in the computer and receiving the answer. Data latency may refer to the time between a query and the results arriving at the screen or the time between initiating a transaction that modifies one or more databases and its completion. . The internal data transfer rate is 8.61 to 13.43 MB/sec. and the maximum disk to system data transfer rate is 33 MB/s (Ultra-DMA) using the ATA-4 interface. Samples of the drive are scheduled for shipment beginning this month (May 1998), with volume production in June 1998. The Computer Division of Hitachi America, Ltd. sells high-capacity, high-performance hard disk drives, CD-ROM CD-ROM: see compact disc. CD-ROM in full compact disc read-only memory Type of computer storage medium that is read optically (e.g., by a laser). , and DVD drives DVD drives come in a variety of speeds and options. The original drive (1x) transferred data at 1.35MB per second. By doubling the spindle speed (RPMs) for 2x drives, the transfer rate increased to 2.7MB/sec and has been increasing ever since. through its Storage Products Group. Hitachi America, Ltd., a wholly owned subsidiary Wholly Owned Subsidiary A subsidiary whose parent company owns 100% of its common stock. Notes: In other words, the parent company owns the company outright and there are no minority owners. of Hitachi, Ltd., Japan, markets and manufactures a broad range of electronics, computer systems and semiconductor products, and provides industrial equipment and services throughout the U.S. Additional company information is available at Hitachi America's web site, at http://www.hitachi.com. Hitachi, Ltd., headquartered in Tokyo, Japan, is one of the world's leading global electronics companies, with fiscal 1996 (ending March 31, 1997) consolidated sales of 8,523 billion yen ($68.7 billion)(a). The company manufactures and markets a wide range of products, including computers, semiconductors, consumer products and power and industrial equipment. For more information on Hitachi, Ltd., please visit Hitachi's Web site at http://www.hitachi.co.jp. (a) At an exchange rate of 124 yen to the dollar. -0-
DK228A-65 Key Specification Summary
Model
DK228A-65
Capacity (formatted) 6.48 GB
Number of disk platters 3
Number of read/write heads 6
User cylinders(Physical) 8,968
Average 12 ms
Seek time (nominal) Maximum 24 ms
Minimum 3 ms
Average rotational latency 7.1 ms
Rotation speed 4,200 RPM
Linear bit density, maximum 250.5 kBPI
Track density 15.6 kTPI
Areal density, maximum 3.9 gigabits per square inch
Recording Technology ID-less format, EPRML
Interface ATA-4
Media data transfer rate 8.61 TO 13.43 MB/s
Interface data transfer rate Max. 16.6 MB/s (PIO Mode 4, DMA 2)
Max. 33.3 MB/s (Ultra DMA 2)
Data buffer size 512kB
Spin-up time
At Power-on 5.0 seconds typical (20.0 seconds max.)
From Standby/Sleep 3.0 seconds typical(20.0 seconds max.)
Dimensions (Width x Depth x Height) 70 x 100 x 12.7 mm
Weight (Typical) 130 g
Power +5.5v +/- 5%,< 100 mvp-p ripple noise
-- Start-up 0.9 A typical
-- Idle 0.19 A typical
-- Seek 0.48 A typical
-- Read/Write 0.46 A typical
-- Stand-by 0.05 A typical
-- Sleep 0.02 A typical
Energy consumption Rate 0.00015 W/MB
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CONTACT: Hitachi America, Ltd. Gladys Mar, 650/244-7829 gladys.mar@hal.hitachi.com or FS Communications Matthew Schmidt, 650/691-1488 matt@fscomm.com |
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