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Home  > Computers and Information Technology  >  Computer Technology & Equipment  >  Storage Devices

Hybrid Drives: How, Why , and When?


Published Date: December 2007
Published By: Objective Analysis
Page Count: 48
Order Code: R3518-3
 
DescriptionTable of ContentsSearch Inside
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Executive Summary
What is a Hybrid Hard Disk Drive?
Elements of a Standard HDD
The DRAM Cache
Limitations of DRAM Caches
A NAND Alternative
NAND’s Nonvolatile Advantage
NAND’s Price Advantage
NAND as a Cache for the HDD
Intel’s Turbo Memory Alternative
SanDisk’s Vaulter Disk
Benefits of the Hybrid HDD
Power Consumption
Access Speed
Reliability
Shock Tolerance
Where the Truth Lies
The Role of Software Support
Why a Cache Needs Software Support
The “Instant-On” Myth
Issues with Legacy
Why will Support Take so Long to Materialize?
Alternatives to Hybrid Drives
Solid State Drives
Strengths
Weaknesses
Standard HDDs
Strengths
Weaknesses
DRAM Write Caches
Strengths
Weaknesses
Increased DRAM Main Memory
Strengths
Weaknesses
Cost Implications of NAND Disk Caches
How NAND Costs will Add to HDD Costs
Consumer Reaction to Costs of Alternatives
Net Benefit to the NAND Market
HDD Makers’ Plans
Devices Currently Introduced
Samsung
Seagate
Fujitsu
Hitachi
Toshiba
Western Digital
Expectations for the Future
What Happens Next?
Near-Term Expectations
Software Changes and Their Impact
A Forecast for Hybrid HDD Shipments
The Impact of Hybrid Drives on the NAND Market
Summary
Methodology
Figures
Tables
Author
Jim Handy

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