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M-Systems, 3.5" Ultra Wide SCSI Fast Flash Disk
3.5" Ultra Wide SCSI Fast Flash Disks
from M-Systems
above - a 2003 featured product
from SSD market history

(parallel) SCSI SSDs

the old fashioned kind - you can still get them
image for parallel SCSI SSD directory
Megabyte always felt confident
on the wide SCSI board walk
SSD news
What is SCSI?
Surviving SSD sudden power loss
some thoughts about SSD customization
is it the end of the line for SCSI Terminators?
LVD, SE, HVD, SCSI compatibility - or lack of it
what defines the pedigree of military SSD companies?
EOL and the unknown original "standard SSD" specification
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the (parallel) SCSI SSD market - by Zsolt Kerekes, editor - July 2012
SCSI hard disks were the mass storage of choice for workstations and servers from around 1988 until 2002 - at which latter point SATA drives began to offer equivalent HDD performance at lower cost.

As a result - nearly every SSD manufacturer which was around in that period offered SCSI SSDs in their product lines. But there weren't so many SSD oems in those days as there are today- only about 20 SSD companies at the end of 2002.

By the time SSD awareness started to hit the wider computer market (in 2005) SCSI was already on its way out - therefore most of the new companies entering the market since that time - and particularly since the 1st phase of the SSD market bubble - saw no good reason to offer SCSI compatible products - focussing initially instead on the high volume markets for PATA SSDs and SATA SSDs for the notebook PC markets.

There are still companies which support the SCSI SSD market - and this is useful for customers who are trying to extend the life of old servers - or avoid redesigning legacy embedded products in the industrial, medical and military markets.

But unlike other segments of the SSD marke the number of companies in the SCSI SSD market is declining.

One reason that the market still exists at all - is simply that if you have a legacy designed computer product with a parallel SCSI interface - then keeping that model or product line going (without expensive redesign costs) may mean you have no other choice in the matter than to look at using SSDs - instead of HDDs - because hard disk makers lose interest in markets when the comparative market volume drops - whereas this is still an upside volume opportunity for many SSD makers.

In the table on the right - I've included companies which have - in recent years offered parallel SCSI SSDs. Some of these product lines may no longer be available. But I hope you find it a useful starting point.
SCSI SSD notes from SSD market history

In 1990 - NEC marketed a 5.25" SCSI SSD using internal battery backed RAM. I benchmarked it for possible Oracle speedup - on a SPARCengine 1.

In 1993 - Solid Data Systems was founded. The company patented technology for Direct AddressingTM - which maximized SSD performance by translating SCSI addresses directly into DRAM eliminating intermediate delays.

In 1996 - ATTO Technology maketed the SiliconDisk II. It was a 5.25" form factor SCSI-3 interface RAM SSD with 64MB to 1.6GB capacity. Throughput was 80MB/s, and performance was 22,000 IOPS.

In June 2001 - Adtron shipped the world's highest capacity 3.5" SCSI flash SSD. The S35PC had 14GB capacity and cost $42,000.

In October 2004 - BiTMICRO Networks shipped the world's first Ultra320 SCSI flash solid state disk.

The 3.5" E-Disk Ultra320 SCSI was OS independent, had 42 µsec access time and a maximum IOPS of 12,500. Sustained R/W rate was 68MB/sec (max) and burst R/W rate was 320MB/sec (max). It could handle operating shock of up to 1500 Gs and extreme temperatures from -40 to +85°C.

See also:- the top 100 SSD articles (updated monthly) which lists and includes abstracts for many articles about the reliability of SSDs and of subsystems and components within SSDs too.

New SSD enhanced hardware and software fabrics will have the same effect on how you come to view a single server - as RAID did on the limitations of a single hard drive.

the Top SSD Companies - 2014 Q3

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new directory of old style (parallel) SCSI SSDs
Editor:- July 10, 2010 - today published a new directory of (parallel) SCSI SSDs. (Scroll down to see a list.)

SCSI SSDs aren't exactly a new topic in the history of the SSD market. I benchmarked a SCSI SSD 20 years ago for use with an embedded SPARC server. And there was a time when 95% of SSD manufacturers made SCSI SSDs. Today that figure is 8%..

This is a market which has resisted the upward suction of the SSD market bubble. Despite that - I know from many reader inquiries that customers with legacy servers, and equipment designers with legacy products still search for SCSI drives - and in many cases SSDs are replacing HDDs - simply because the original hard disk manufacturers have end of lifed SCSI models. But many of the new SCSI SSDs available today aren't simply fossilized versions of old designs. They include new security, performance and reliability features.

As an editor - creating a new SCSI SSD list has been low on my priorities - because I thought the market had nearly gone away - and I hoped I wouldn't have to do it. I was wrong. More SCSI SSDs are being shipped today than at any time in the past. It's never going to be a huge market - but for those of you who have been looking - here it is.
SCSI SSD - oems list
Although most companies no longer support the parallel SCSI market - the SSD makers in this list below still seem to be supplying SCSI compatible products.
ACARD Technology




Hagiwara Sys-Com



Phoenix International

Reactive Group

Real Ram Disk

Red Rock Technologies


Targa Systems Division

Vanguard Rugged Storage
classic SSDs from SSD market history
MegaRam-35 solid state disk from Imperial Technology - click for more info
MegaRam-35 - 3.5" SCSI SSD
from Imperial Technology
The product shown above is an example of a 3.5" parallel SCSI SSD featured here on in June 2002.
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