Toshiba Reveals Hybrid HDD Research

Hybrid HDD - An HDD with a NAND Flash CacheNikkei Electronics published an article on May 22 detailing a May 17 briefing by Toshiba president Norio Sasaki. Mr. Sasaki told of the company’s plans to introduce a hybrid HDD (HHDD) in September of this year that is aimed at the Ultrabook market. The article notes that Toshiba is the only company that produces both NAND flash and HDDs, now that Samsung sold its HDD business to Seagate.

The article also says that Toshiba: “aims to become one of the top three companies in the HDD market in terms of market share.” The SSD Guy is forced to wonder at this comment, since there are only three HDD manufacturers in existence today: Toshiba, Western Digital, and Seagate.

The Seagate Momentus XT, the only Continue reading “Toshiba Reveals Hybrid HDD Research”

SSDs and RAID

RAID ConfigurationThe SSD Guy has been asked a number of questions lately about SSDs and RAID.  Most of these center around the difference in failure behaviors between SSDs and HDDs – HDDs fail randomly (if ever), while SSDs fail relatively predictably due to wear.

Oddly enough, SSD failures due to wear make them a little friendlier than HDDs.  The wear mechanism is managed by the controller in the SSD.  SSDs have spare blocks, and the controller manages those blocks, so the controller understands exactly how much wear the SSD has undergone and how much room is left before the SSD will start to have difficulties. Continue reading “SSDs and RAID”

Are HDDs Obsolete?

This looks like more fun than reading The SSD GuyAn article in the Storage Newsletter caught The SSD Guy’s eye when it ran in July.  The article consisted of a press release followed by an editorial comment:

While hard drives still have the cost advantage, it appears it’s becoming akin to sticking with a horse-drawn buggy in an age of automobiles by arguing that the upfront cost for a car is so much more than the cost of a horse. At some point, it just doesn’t make sense to ride a horse. How soon until the IT world gets there?

Continue reading “Are HDDs Obsolete?”

When will SSD Prices Drop Below HDD Prices?

From Objective Analysis Report: How PC NAND Will Undermine DRAMThe SSD Guy often hears people ask: “When will SSD prices drop below the prices of HDDs?”

This makes a lot of sense.  After all, NAND flash, which makes up the bulk of the cost of an SSD is renowned for its rapidly-falling prices.

The short answer to this question is: “Never!” Continue reading “When will SSD Prices Drop Below HDD Prices?”

An HDD Cache for an SSD?

University of TorontoA colleague – Isilon’s Rob Peglar – pointed out an interesting paper written by researchers at the University of Toronto in collaboration with Microsoft.  The paper makes a case for using an HDD to cache writes to an SSD to improve storage system performance.

“Wait a minute!” you say.  “An HDD as a cache for an SSD?  This can’t be possible!” Continue reading “An HDD Cache for an SSD?”