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قدیمی 06-10-2012, 03:41 PM   #1
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Exclamation اخبار هارد دیسک های Sata و IDE

جدیدترین اخبار و مقايسه و بحث پیرامون معرفی و اخبار هارد دیسک های Sata و IDE در این بخش قرار خواهند گرفت.
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قدیمی 01-19-2013, 11:39 AM   #2
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Lightbulb آشنايى با هارد ديسك sata

در ابتدا لازم است تعريفى از هارد ديسك داشته باشيم و بدنبال آن، اطلاعات بيشترى در قبال انواع آن بياموزيم.
هارد ديسك، يك قطعه سخت افزارى است كه توسط موادى كه پوشش داده شده است، اطلاعات مختلف را بصورت مغناطيسى ضبط ميكند. به اين منظور در ديسك هاى قديمى از اكسيد آهن استفاده ميشد، اما امروزه از آلياژ كبالت استفاده ميشود.
احتمالأ اولين هارد ديسك در سال 1950 اختراع شد و به مرور زمان تحولاتى بر روى آن پديد آمد. هارد ديسك هاى اوليه شامل ديسك هايى با قطر زياد بود و قدرت ذخيره سازى اطلاعات اندكى داشت.
در ديسك هاى سخت امروزى، سرعت چرخش ديسك به 10000 دور در دقيقه ميرسد. ميزان ذخيره اطلاعات در اين ديسك ها از فلاپى بيشتر بوده و با توسعه تكنولوژى، روزانه به اين ميزان افزوده ميشود.
در هارد ديسك هاى sata، براى انتقال اطلاعات، از فيبر نورى يا كابل هاى مخصوصى استفاده ميشود. در حال حاضر دو مدل از اين هارد به بازار عرضه شده است، كه عبارت اند از: Sata و sata ii. سرعت انتقال اطلاعات در sata برابر با 150mb و در نوع sata ii برابر با 300mb ميباشد.
در رابطه با نحوه استفاده از كابل رابط sata، يك نكته حساس وجود دارد، و آن عدم مقاومت آن در برابر تاشدن و انعطاف پذيرى آن ميباشد. البته مزيت اين كابل ها، باريك بودن آنها ميباشد كه براحتى در كيس جابجا شده و براى كاربر مزاحمتى ايجاد نميكنند و از سوى ديگر مانع از تحويه هواى داخل كيس نميشوند.
بهترين مزيتى كه كابل هاى sata بدنبال دارند، باريك بودن آنها ميباشد. زيرا در هاردهاى قديمى، انتقال اطلاعات توسط همين كابل ها صورت ميگرفت. اما آن كابل ها بصورت پهن بودند و در كنار اشغال نمودن فضاى زياد، از چندين رشته ساخته شده بودند كه اين امر، دريافت اطلاعات را با مشكلاتى از قبيل رسيدن ناقص آنها مواجه ميكرد.
تصاویر کوچ فایل پیوست
hard_disk_drive_system.jpg   sata_cable.jpg   sata-power-latching-cable.jpg   ide-drive-sata-adapter-plug-image-2.jpg  
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قدیمی 08-28-2014, 09:50 AM   #3
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تاریخ عضویت: Aug 2011
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پیش فرض پاسخ : اخبار هارد دیسک های Sata و IDE

هارد دیسک های 8 ترابایتی Seagat

Seagate scoffs at helium, ships world’s first 8TB hard drive

Seagate today announced it's shipping to enterprise customers the world's first 8TB hard disk drive, raising the bar against rivals such as Western Digital, which uses helium to boost its own drive capacity.
Seagate's new 8TB drive comes in a 3.5-in form factor and is aimed at allowing corporate data centers to create more dense storage arrays for cloud content, object-based storage and data backups.
"Public and private data centers are grappling with efficiently storing massive amounts of unstructured digital content," John Rydning, IDC's research vice president for hard disk drives, said in a statement. "Seagate's new 8TB HDD provides IT managers with a new option for improving storage density in the data center, thus helping them to tackle one of the largest and fastest growing data categories within enterprise storage economically." Just four months ago,Seagate released its first 6TB, enterprise-class hard disk drive, which was 28% faster than its earlier 4TB drive. Last November, Western Digital's HGST subsidiary made a splash in the industry by announcing the first 6TB helium-filled Ultrastar He6 drive.
Using helium, WD was able to increase its drive capacity by 50%; more importantly, it reduced power usage by 23% and overall weight by 38% compared to pervious 4TB drives.
At the time WD announced its helium drive, Seagate representatives said they weren't ruling out the future use of the lighter weight gas, which reduces friction in a spinning disk. While Seagate is not using helium in its new 8TB drive, it's also not releasing details about how it has been able to increase the areal density on the disk platters. A spokesman said that information will be "shared shortly." Last year, Seagate began using a technology called shingled magnetic recording (SMR) to increase the capacity of its drives beyond 4TB.Seagate has said SMR holds the promise of creating 20TB drives by 2020. With SMR technology, Seagate has been able to increase bit density on its platters by 25% or more. Unlike standard perpendicular magnetic recording, where data tracks rest side by side, SMR overlaps the tracks on a platter like shingles on a roof, thereby allowing Seagate to squeeze more tracks together on a platter.
Seagate’s 6TB hard drive, announced in April, used SMR and increased areal density from 831Bbits per square inch in the previous 4TB drive to 1,000 Gbits.
Seagate did say its new 8TB Enterprise Capacity 3.5 HDD increases system capacity using fewer components at lower power costs.
The drive boasts the best watts-per-gigabyte to date for enterprise bulk data storage, Seagate said.
Seagate is shipping drives to select customers now, with wide scale availability next quarter.
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ویرایش توسط AsadSAAD : 08-28-2014 در ساعت 09:56 AM
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قدیمی 08-28-2014, 09:59 AM   #4
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پیش فرض پاسخ : اخبار هارد دیسک های Sata و IDE

خبر تکمیلی به نقل از : Seagate Ships World’s First 8TB Hard Drives | Seagate

Seagate Ships World’s First 8TB Hard Drives


8TB Hard Drives Boast Ultra-High Capacity, Energy-Efficiency and the Lowest TCO in the Industry
CUPERTINO, Calif. — Seagate Technology plc (NASDAQ:STX), a world leader in storage solutions, today announced it is shipping the world’s first 8TB hard disk drive. An important step forward in storage, the 8TB hard disk drive provides scale-out data infrastructures with supersized-capacity, energy-efficiency and the lowest total cost of ownership (TCO) in the industry for cloud content, object storage and back-up disaster recovery storage.
“As our world becomes more mobile, the number of devices we use to create and consume data is driving an explosive growth in unstructured data. This places increased pressure on cloud builders to look for innovative ways to build cost-effective, high capacity storage for both private and cloud-based data centers,” said Scott Horn, Seagate vice president of marketing. “Seagate is poised to address this challenge by offering the world’s first 8TB HDD, a ground-breaking new solution for meeting the increased capacities needed to support the demand for high capacity storage in a world bursting with digital creation, consumption and long-term storage.”
A cornerstone for growing capacities in multiple applications, the 8TB hard drive delivers bulk data storage solutions for online content storage providing customers with the highest capacity density needed to address an ever increasing amount of unstructured data in an industry-standard 3.5-inch HDD. Providing up to 8TB in a single drive slot, the drive delivers maximum rack density, within an existing footprint, for the most efficient data center floor space usage possible.
“Public and private data centers are grappling with efficiently storing massive amounts of unstructured digital content,” said John Rydning, IDC’s research vice president for hard disk drives. “Seagate’s new 8TB HDD provides IT managers with a new option for improving storage density in the data center, thus helping them to tackle one of the largest and fastest growing data categories within enterprise storage economically.”
The 8TB hard disk drive increases system capacity using fewer components for increased system and staffing efficiencies while lowering power costs. With its low operating power consumption, the drive reliably conserves energy thereby reducing overall operating costs. Helping customers economically store data, it boasts the best Watts/GB for enterprise bulk data storage in the industry.
“Cleversafe is excited to once again partner with Seagate to deliver to our customers what is truly an innovative storage solution. Delivering absolute lowest cost/TB along with the performance and reliability required for massive scale applications, the new 8TB hard disk drive is ideal for meeting the needs of our enterprise and service provider customers who demand optimized hardware and the cost structure needed for massive scale out,” said Tom Shirley, senior vice president of research and development, Cleversafe.
Outfitted with enterprise-class reliability and support for archive workloads, it features multi-drive RV tolerance for consistent enterprise-class performance in high density environments. The drive also incorporates a proven SATA 6Gb/s interface for cost-effective, easy system integration in both private and public data centers.
Shipping drives to select customers now with wide scale availability next quarter.
About Seagate
Seagate is a world leader in storage solutions. Learn more at www.seagate.com. Follow Seagate on Twitter, Facebook, Google +, YouTube, Instagram and subscribe to our blog.
Copyright 2014 Seagate Technology LLC. All rights reserved. Printed in the United States of America. Seagate, Seagate Technology and the Wave logo are trademarks or registered trademarks of Seagate Technology LLC in t [IMG]file:///C:/Users/412030/AppData/Local/Temp/xsueosih9059137068322655636.png[/IMG] he United States and/or other countries. When referring to drive capacity, one terabyte, or TB, equals one thousand billion bytes. Your computer’s operating system may use a different standard of measurement and report a lower capacity. In addition, some of the listed capacity is used for formatting and other functions and will not be available for data storage.


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قدیمی 08-28-2014, 10:02 AM   #5
Big Boss
 
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تاریخ عضویت: Aug 2011
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Arrow پاسخ : اخبار هارد دیسک های Sata و IDE

کمی بیشتر در مورد آخرین تکنولوژی های Seagate


Breaking Capacity Barriers With Seagate Shingled Magnetic Recording



Seagate Shingled Magnetic Recording, or SMR, is breaking barriers to new areal densities and adding greater than 25% capacity growth by maximizing the number of tracks per inch on a single disk.

As our world becomes more mobile, the number of devices we use to create and consume data continues to drive a demand for high capacity. In fact, Seagate predicts that households generating 1TB of data monthly by doing things like streaming or creating content, viewing photos, sharing music, etc., will grow 20 times by 2015.1
Seagate introduced one of the world’s first perpendicular recording drives. By 2007, this helped us achieve up to 250GB on a single disk under our Barracuda® brand of desktop hard drives. Five years later that same technology evolved to 1TB per disk, also introduced by Seagate, achieving the highest known areal density or tracks per inch to deliver the highest capacity point using perpendicular recording. Yet even at 1TB per disk and 4TB per drive, consumers continue to demand more storage.
So, what’s next? How can we continue to grow areal densities to meet the demand for high capacity in a world bursting with digital creation and consumption?

Introducing Seagate SMR
Seagate Shingled Magnetic Recording, or SMR, is breaking barriers to new areal densities and adding greater than 25% capacity growth by maximizing the number of tracks per inch on a single disk.


Traditionally, track spacing shrank with the size of the recording head’s reader and writer elements (Figure 1).

Figure 1. Conventional Track Spacing
The reader and writer elements of today’s perpendicular magnetic recording HDDs have reached a physical limitation. Without future recording technologies, they cannot become smaller, nor can the tracks they read and write.
SMR achieves higher areal densities by squeezing tracks closer together. Tracks overlap one another, like shingles on a roof, allowing more data to be written to the same space. As new data is written, the drive tracks are trimmed, or shingled. Because the reader element on the drive head is smaller than the writer, all data can still be read off the trimmed track without compromise to data integrity or reliability. In addition, traditional reader and writer elements can be used for SMR. This does not require significant new production capital to be used in a product, and will enable SMR-enabled HDDs to help keep costs low.

Figure 2. Track Spacing Enabled by SMR Technology
When a user needs to rewrite or update existing information, SMR drives will need to correct not only the requested data, but any data on the following tracks. Since the writer is wider than the trimmed track, all data in surrounding tracks are essentially picked up and as a result will need to be rewritten at a later time (Figure 3). When the data in the following track is rewritten, the SMR drive would need to correct the data in the subsequent track, repeating the process accordingly until the end of the drive.

Figure 3. Writer Overlap on Trimmed Tracks
For this reason, SMR groups tracks into bands, where the shingling process stops (Figure 4). This enables an SMR drive to better manage these rewrites. This also improves the drive’s write performance by grouping tracks into bands that optimize the number of tracks that need to be rewritten.

Figure 4. SMR Band Structure
The architecture of a band within an SMR drive is customized for the application in which the drive will be integrated. Each drive family addresses its specific product needs and uses SMR to deliver the best results by application.
Summary
Seagate SMR is an effective technology to address the immediate need for higher capacity. As SMR continues to evolve, it may be used in conjunction with other emerging technologies to increase the areal density of future products.
Ongoing testing and development is in place within Seagate and with our partners to identify best practices for SMR in a variety of applications. Seagate also spearheads committees to standardize the way SMR technology can be used most effectively.
Seagate is first to introduce another cutting edge technology—the world’s first SMR hard drive—in 2014, which improves areal densities by 25% in our first-generation product. SMR allows Seagate to leverage current drive architecture, making it the most cost-effective technology existing today.
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