GetUSB.info just posted a nice article on how to read the PSN from an SD card, or product serial number.Â Some also call this reading the CID number from an SD card.Â The CID number is a unique identifier number or serial number created on the SD or microSD media at the time of manufacturing.Â This is a number which cannot be changed or manipulated by the host computer.
The CID number is most often used for vendors or manufacturers to lock in software to a specific device.Â Since the CID number cannot be changed or modified, it’s a great way to prevent unauthorized distribution or content or software.
Some manufacturers require to read the CID number from SD media before the software is published and this is what GetUSB.info talks about.Â For a full description of the article, make the jump:Â How to read CID number from SD media.
Here is a snap shot of the CID reading tool for 20 SD devices:
SD cards come in all sorts of GB sizes and speeds.Â Today I thought it a good idea to take a look inside an SD card along with breaking out the speed differences.
To start, the SD media is broken down into “Classes”Â 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 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”:
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
I’ve heard plenty of stories about fake flash sellers on eBay.Â Typically we see counterfeits with crooks changing the VendorID and ProductID of an ultra cheap brand to something premium for USB sticks [say a Sony MicroVault] but the thieves are also getting into SDHC cards, SD, CF and other media types.
What is amazing, is the willingness of these crooks to make good and show their good will towards a “bad situation” while all the while sticking it to you.
I recently found a website called SOSFakeFlash which documents many of these situations.
Take a quick read – it’s interesting to see what these crooks are up to – but at the same time know this:
SanDisk announced today a massive 12GB microSDHC card which is 50% larger in storage capacity than it’s previous model (8GB).
So what does this mean?Â It means our mobile devices are getting one step closer to becoming a storage medium for all sorts of data, phone related or not.Â From MP3 files, video and data files … with 12GB of flash memory, quit a lot can fit.Â To put things into perspective, the microSDHC can hold [about] 1,500 MP3 songs, 3,600 photos and 24.5 hours of video.
If you haven’t used or seen a microSDHC card, make sure you stop off at your local computer store and take a look.Â The size is incredibly small.Â About the size of your pinky fingernail.
Some background info:Â The SDHC format applies to SD flash memory which is larger than 2GB is storage space.Â The new 12GB microSDHC card conforms to the SD 2.00 specification and has the theoretical maximum storage capacity of 32GB.
On a closing note, the new SanDisk microSDHC card has a transfer speed compatible with the Class 4 specification.Â Too geeky for ya – let me sum it up:
Okay, so UDMA is not U-Da-MAn but the new Lexar card reader is cool enough looking to make them “the man.”
The new UDMA (Ultra Direct Memory Access) is a pop-top design which upon clicking the top cover (say on the Lexar logo) the card reader slots pop up for flash memory access.
The Lexar card reader connects to your PC via mini-to-full-size USB cable. The device readers either CompactFlash compatible or SDHC compatible SD cards.
So just to bring everyone up-to-speed: What is UDMA technology?: