Posts Tagged ‘Secure Digital’

SD Class Break Down

SD cards come in all sorts of GB sizes and speeds.  Today I thought it a good idea to take a look inside an SD card along with breaking out the speed differences.

sd class

To start, the SD media is broken down into “Classes”  The Class depicts the speeds at which a device reads and writes.
 
There are different speed grades available, measured the same as CD-ROMs, in multiples of 150 kB/s (1x = 150 kB/s). Basic cards transfer data up to six times (6x) the data rate of the standard CD-ROM speed (900 kB/s vs. 150 kB/s).
 
The maximum read speed and maximum write speed may be different. Maximum write speed typically is lower than maximum read speed. Some digital cameras require high-speed cards (write speed) to record video smoothly or capture multiple still photographs in rapid succession. This requires a certain sustained speed, or the video stops recording. For recording, a high maximum speed with a low sustained speed is no better than a low speed card. The 2.0 specification defines speeds up to 200x.
 
Some manufacturers use the read speed in their X-ratings, while others (Kingston, for example) use write speed.

sd class speed

SD Cards and SDHC Cards have Speed Class Ratings defined by the SD Association. The SD Speed Class Ratings specify the following minimum write speeds based on “the best fragmented state where no memory unit is occupied”:[9]
  • Class 2: 2 MByte/s – 13x
  • Class 4: 4 MByte/s – 26x
  • Class 6: 6 MByte/s – 40x
SD and SDHC cards will often also advertise a maximum speed (such as Continue Reading 6 Comments

Boot Your MacBook Pro From SD Slot

macbook pro sd slotMacWorld posted an article about a French website getting the MacBook Pro to boot from a SD card in the SD slot.  Not a huge feat, but I think it’s an indication that laptop manufacturers, both PC and Mac, will continue going down the road of being Optical-less [if that’s a world]. If you are a MacBook Pro owner and interested in this bootability, please visit the following link: here. The MacWorld article also mentioned a new SD format of SDXC which is based off the new Windows exFAT format for extended FAT and FAT32 sizes.  I’ll dig up some research on this and report back. Source: MacWorld. Continue Reading 54 Comments

Samsung Considers Bid For SanDisk

Samsung is looking to strengthen their digital memory storage line with a possible purchase of SanDisk.  SanDisk is currently the #1 supplier of solid state flash memory, world wide [such as Secure Digital, miniSD, microSD and many more].  Samsung is the top producer of flash memory chips.

samsung sandisk buy out

Through an acquisition, Samsung would strengthen it’s channel for supplying it’s flash chip to retail and channel sales of end-user flash memory. With weak chip prices and fluctuating buyer habits, a move like this could strengthen Samsung’s position and would put Samsung at over 50% of world wide control of production, distribution and sales of NAND flash memory.
Avi Cohen of Avian Securities said it was an “unlikely prospect” due to SanDisk being unwilling to sell at the bottom of the cycle, and Samsung becoming a direct competitor to many of its customers and regulatory concerns. “Regulators in the US, Korea and Europe among others will likely have issue with one player controlling north of 50 per cent of NAND [Flash memory] supply,” he said.
Another option is Samsung reducing it’s royalty license to SanDisk to gain synergy with the top seller, reduce SanDisk’s bottom line and secure channel distribution of flash memory.
However if a deal goes ahead, it could block efforts by Samsung rivals Toshiba and Hynix Semiconductor to topple Samsung’s market leadership. Toshiba runs joint production lines with SanDisk and Hynix is also conducting joint re-search with the US group. Samsung controls 42.3 per cent of the NAND flash memory market, trailed by Toshiba with 27.5 per cent and Hynix with 13.4 per cent, says market researcher iSuppli.
Source:  Financial Times. Continue Reading 2 Comments

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