SanDisk Also Proposes Two Metrics for End-Users to Measure Performance and Endurance: virtualRPM (vRPM) and Long-Term Data Endurance (LDE)LOS ANGELES, Nov 05, 2008 (BUSINESS WIRE) -- --ExtremeFFS(TM) greatly accelerates SSD random write speeds and endurance
--vRPM allows consumers to measure and compare SSD and hard disk drive performance
--Industry encouraged to adopt a simple endurance metric to determine the lifespan of an SSD
(NASDAQ:SNDK) today unveiled an advanced flash file system for
solid-state drives (SSDs) that yields dramatic improvement in
performance and reliability for computing applications. Called ExtremeFFS(TM),
this next-generation patented flash management system --
which has the potential to accelerate random write speeds by up to 100
times over existing systems -- will ship in
SanDisk products during 2009.
Speaking in Los Angeles at WinHEC 2008, Rich Heye, senior vice president
and general manager for SanDisk's Solid-State
Drive (SSD) Business Unit, presented ExtremeFFS along with two metrics --
vRPM and LDE -- that can help end-users
evaluate SSDs. vRPM enables comparisons in performance between an SSD
and a hard disk drive (HDD) or another SSD, and LDE calculates the
lifespan of a solid-state drive.
For SSDs to perform optimally in Windows Vista, and thus replicate or
surpass the functionality of hard disk drives, a new flash management
technology is needed to accelerate SSD write speed and endurance, he
said. "SSDs will revolutionize client
storage, but we need new benchmarks that allow them to be treated
differently than HDDs."
In 1994 SanDisk introduced TrueFFS(TM),
which has been the leading flash file system for major mobile handset
vendors. TrueFFS was incorporated into one previous version of Windows,
as the PCMCIA FTL of choice for its performance, scalability and low
overhead. When using an SSD under Windows Vista, the demands on the SSD
require a large quantity of random writes, as opposed to sequential
access. "The mismatch to block size is
significant," said Heye.
Enter Extreme FFS
To maximize random write performance, SanDisk developed the ExtremeFFS
flash file management system. This operates on a page-based algorithm,
which means there is no fixed coupling between physical and logical
location. When a sector of data is written, the SSD puts it where it is
most convenient and efficient. The result is an improvement in random
write performance -- by up to 100 times --
as well as in overall endurance.
ExtremeFFS incorporates a fully non-blocking architecture in which all
of the NAND channels can behave independently, with some reading while
others are writing and garbage collecting. Another key element of
ExtremeFFS is usage-based content localization, which allows the
advanced flash management system to "learn"
user patterns and over time localize data to maximize the product's
performance and endurance. "This feature
might not show up in benchmarks, but we believe it is the right thing to
do for end-users," Heye said.
New Performance and Endurance Metrics
Since hard drive performance is measured in RPMs (revolutions per
minute), SSDs need a simple performance metric for comparisons, he said.
virtual RPM (vRPM) accurately and easily allows consumers to compare
SSDs to HDDs and to each other when used in PCs, said Heye. "vRPM
answers the question: How fast would you have to spin a virtual HDD to
achieve the level of performance seen by an SSD in a client PC?"
Heye predicted that SSD net performance next year will be four times
faster than the current generation of SSDs and nearly six times that of
the latest 2.5-inch HDDs.
Commenting on vRPM, Joseph Unsworth, research director at Gartner, said, "There
has been a deluge of SSD products with varying levels of quality that
have created undeserved hype and confusion for consumers and
corporations. Industry support behind a common metric that clearly
articulates the value proposition of an SSD on a like for like basis to
a HDD will be instrumental in driving end-user understanding and
subsequent adoption as prices continue to fall."
Apart from vRPM, SanDisk is proposing Long-Term Data Endurance (LDE),
which simplifies endurance as a useful number, as the first industry
metric of long-term data endurance. "This is
a lot like measuring tread wear on a tire,"
said Heye. Major PC OEMs and SSD competitors have reviewed and commented
on SanDisk's initial proposal, he added, and
SanDisk has submitted a proposal and white paper to JEDEC, the leading
developer of standards for the solid-state industry.
LDE represents the total amount of data writes allowed in the lifespan
of an SSD. SanDisk will spec LDE on its future PC SSD products and "we
strongly encourage others to follow SanDisk's
lead," he added.
Regarding LDE's impact on SSD adoption, Greg
Wong of Forward Insights said, "LDE allows
OEMs a simple way to compare SSDs and determine, based on the
applications usage patterns, which drives are suitable for a particular
application. The beauty of LDE is that it captures endurance in one
single, understandable figure. A common metric is necessary to
facilitate SSD adoption moving forward."
(Note: The LDE proposal and white paper, along with a backgrounder on
vRPM, is available on the SanDisk website at www.sandisk.com/SSD/Tech_and_metrics).
SanDisk Corporation, the inventor and world's
largest supplier of flash storage cards, is a global leader in flash
memory -- from research, manufacturing and
product design to consumer branding and retail distribution. SanDisk's
product portfolio includes flash memory cards for mobile phones, digital
cameras and camcorders; digital audio/video players; USB flash drives
for consumers and the enterprise; embedded memory for mobile devices;
and solid state drives for computers. SanDisk (www.sandisk.com/corporate)
is a Silicon Valley-based S&P 500 company, with more than half its sales
outside the United States.
SanDisk's product and executive images can be
downloaded from http://www.sandisk.com/corporate/media.asp
SanDisk's web site/home page address: http://www.sandisk.com
SanDisk and the SanDisk logo are trademarks of SanDisk Corporation,
registered in the United States and other countries.
ExtremeFFS and TrueFFS are trademarks of SanDisk Corporation. Other
brand names mentioned herein are for identification purposes only and
may be the trademarks of their respective holder (s).
This press release contains certain forward-looking statements,
including expectations for new product introductions, technology
measurement standards, applications, markets, and customers that are
based on our current expectations and involve numerous risks and
uncertainties that may cause these forward-looking statements to be
inaccurate.Risks that may cause these forward-looking statements to be
inaccurate include among others: the proposed standards may not be
adopted by the market, market demand for our products may grow more
slowly than our expectations or there may be a slower adoption rate for
these products in new markets that we are targeting, and the other risks
detailed from time-to-time in our Securities and Exchange Commission
filings and reports, including, but not limited to, our annual report on
Form 10-K and our quarterly reports on Form 10-Q. We do not intend to
update the information contained in this press release.
SOURCE: SanDisk Corporation
Ken Castle, 408-801-2195