Samsung has announced production of the first flash memory cards to use its
20-nanometer (nm) process technology. It will incorporate the new 32 gigabit MLC
NAND chips into memory cards ranging from 4GB through 64GB capacities. According
to the company, the 20nm-class MLC NAND chips deliver 50% higher productivity
level and 30% faster write speeds than the previous generation 30nm chips.
Samsung has started shipping 20nm-class 32Gb NAND based SD card samples to
customers and plans to expand production later this year.
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SAMSUNG Producing Industry’s First Higher-performing
20nm-class NAND Flash Memory
Seoul, Korea - April 19, 2010 : Samsung Electronics Co., Ltd., the world leader in advanced semiconductor technology solutions, today announced the industry's first production of 20 nanometer (nm) class NAND chips for use in Secure Digital (SD) memory cards and embedded memory solutions. Based on this cutting-edge technology, the introduction of 32 gigabit (Gb) MLC NAND will expand the company's memory card solutions for smart phones, high-end IT applications and high-performance memory cards.
Mr. Soo-In Cho, president, Memory Division, Samsung Electronics, said "In just one year after initiating 30nm-class NAND production, Samsung has made available the next generation node 20nm-class NAND, which exceeds most customers requirements for high-performance, high-density NAND-based solutions." He added, "The new 20nm-class NAND is not only a significant step forward in process design, but we have incorporated advanced technologies into it to enable substantial performance innovation."
Samsung's 20nm-class MLC NAND has a 50 percent higher productivity level than 30nm-class MLC NAND. The write performance of a 20nm-class-based, eight gigabyte (GB) and higher density, SD card is 30 percent faster than the 30nm-class NAND and it delivers a speed-class rating of 10 (read speed of 20MB/s, write speed of 10MB/s). By applying cutting-edge process, design and controller technology, Samsung also has secured reliability levels comparable to 30nm-class NAND.
Samsung Electronics first began producing 32Gb NAND with 30nm-class process technology in March 2009. Now it is shipping SD card samples to customers that are built with 20nm-class 32Gb NAND and will expand production later this year.
Memory cards based in the 20nm-class will be available from 4GB through 64GB densities
Samsung's timely introduction of its high-performance premium NAND will better support the growing memory requirements of high-density smartphones, high-end IT applications and high-performance memory cards.
IDE (ATA) emulation speed is usually specified in "x" ratings, e.g. 8x, 20x, 133x. This is the same system used for CD-ROMs and indicates the maximum transfer rate in the form of multiplier of the data rate of an audio CD, which is 150 KB/s.
where R = transfer rate, K = speed rating. For example, 20x rating means 20 * 150 KB/s = 3,000 KB/s = 3 MB/s.
These are manufacturer speed ratings and actual transfer speed may be higher or sometimes lower that one shown on a card
There are different speeds of SD card available. The official unit of measurement is the Speed Class Rating; an older unit of measurement is the × rating.
Speed Class Rating
The Speed Class Rating is the official unit of speed measurement for SD Cards, defined by the SD Association. It is equal to 8 Mbit/s, and it measures the minimum write speeds based on "the best fragmented state where no memory unit is occupied
The following are the ratings of some currently available cards:
Even though the class ratings are defined by a governing body, like × speed ratings, class speed ratings are quoted by the manufacturers but unverified by any independent evaluation process.
- Class 2: 16 Mbit/s (2 MB/s)
- Class 4: 32 Mbit/s (4 MB/s)
- Class 6: 48 Mbit/s (6 MB/s)
- Class 10: 80 Mbit/s (10 MB/s)
Important differences between the Speed Class and the traditional CD-ROM drive speed measurement ("×" speed ratings) are:
On 21 May 2009, Panasonic announced new class 10 SDHC cards, claiming that this new class is "part of SD Card Specification Ver.3.0". Toshiba also announced cards based on the new 3.0 spec As of December 2009, the SD Association's Web site does not include information on this new class or new specification.
- 1. the ability of the host device to query the SD card for the speed class and determine the best location to store data that meets the performance required
- 2. class speed defines the minimum transfer speed.
Since the class rating is readable by devices, they can issue a warning to the user if the inserted card's reported rating falls below the application's minimum requirement.
The × rating is a unit of measurement equal to 1.2 Mbit/s. It is derived from the standard CD-ROM drive speed of 1.2 Mbit/s. Basic cards transfer data up to six times (6×) the data rate of the standard CD-ROM speed (7.2 Mbit/s vs 1.2 Mbit/s). The 2.0 specification defines speeds up to 200×, but unlike the class rating system, does not mandate that x-ratings measure the card's sustained write-speed. For most cards, the maximum read speed is typical faster than its maximum write speed, leading some manufacturers to use read-speed as the ×-rating measurement. Other vendors, such as (Kingston, use write-speed.[
This table lists common ratings and minimum transfer rates.