Viking Memory Cards

Viking Memory Cards

Viking 64 MB Secure Digital CardViking Interworks manufacturers only the highest quality products using only high-quality components, adhering to strict quality control guidelines, certified testing processes, and design specifications. Providing this form fit solution enables faster loading, faster graphics rendering, and less computer errors. Viking's high quality components guarantee flawless operation, even under the harshest conditions and install is a snap with Viking's comprehensive install guide or toll free tech support. Buy Viking Memory Cards here

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  Compact Flash Card Size
  Viking 4 GB - CompactFlash Card ( CF4GB ) Buy new: $319.99
  Viking 1 GB CompactFlash Card (CF1GB) from $18.98
  Viking 64 MB CompactFlash Card from $16.98
  SD Flash Card Size (SDHC)
Please verify that your device such as cellular phone or digital camera supports SDHC cards. SDHC cards are not compatible with standard SD host devices and card readers, and will only work on SDHC host devices.
  Viking 512 MB Secure Digital Flash Card (SD512M) from $14.98
  Viking 256 MB Secure Digital Card (SD256M-P) from $31.99
  Viking 128 MB Secure Digital Card (SD128M-P) $53.89
  Viking 64 MB Secure Digital Card (SD64M-P) Buy new: $41.89


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. R = {K \cdot 150}, KB/sec 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:

  • 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)
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.

Important differences between the Speed Class and the traditional CD-ROM drive speed measurement ("" speed ratings) are:

  • 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.
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.


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.
Rating Write Speed
SD Class
6 7.2  
10 12.0  
13 16.0 2
26 32.0 4
32 38.4 5
40 48.0 6
66 80.0 10
100 120.0 15
133 160.0 20
150 180.0 22
200 240.0 30
266 320.0 40
300 360.0 45

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