ridata web store FAQ section

There is a difference of resolution. If you need high resolution for your picture, it will take more memory, and vice versa. In case of a different brand of DSC with the same quality pixel, the image size probably differs according to its compression and resolution setting in your DSC, even works in the same DSC.

Because SDHC works differently (supports the new higher capacity cards) this new cards format is NOT backward compatible with legacy SD format host devices. You can contact device manufacturer for the compatibility questions or Ridata technician for assistance.

The File Allocation Table (FAT) stores the information, such as the filename, location, size, etc. required for a user to access their data. FAT16 uses file allocation table entries that are 16 bits in length. Hard drives using FAT16 are limited to 2GB partitions. FAT32 was developed to break through the 2GB restriction, while still being backward compatible with FAT16. FAT32 is able to support volumes up to 2048GB. Most personal electronics today using flash memory use FAT16. If you are not sure whether or not your device supports FAT32, we recommend formatting the flash card to FAT16

There are many possible reasons for this situation: 1. The DSC is suddenly turned off when data is being read or written. 2. The memory card is suddenly taken out when the DSC is reading or writing data. 3. Photos are taken when the battery low. 4. The memory card is passed through an X ray. 5. The memory is close to a magnetic device. 6. The memory card is suddenly taken out when the card reader is reading or writing data onto the card. Generally , if users do not use the memory properly, problems might come up. If a problem occurs without any of these improper usage reasons, please issue a "Format" command on a PC by card reader. If the drive can't be "Format" please contact RITDATA service department for help.

Like CD-R, DVD-R, X stand for speed. 1X stands for 150kbytes/sec while 52x stands for 7.8MB/per sec. Manufacturers calculate speed differently. In general, "Sustained write speed" is approximately 900KB~3.6MB or 6X~24X, "Sustained read speed" is 1.8MB~7.2MB or 12X~48X, and "the Weighted averages method" is 12MB~5.4MB or 8X~36X. Thus speed ranges differ quite a lot depending on the method of calculation. RITEK considers calculating by "the sustained write speed" to be more accurate.

So for in Card Readers and PDAs, this has occurred only when the card is pulled out imprudently while it is still working or there is a format problem. If you plug in or unplug the card improperly, it will be disabled. Do not pull out the card before completion of data retrieval on your system while the DRAM memory is still working or the card will fail. This is due to error in the file system which will take up some available flash memory. To solve it, just re-format.

The format of the SD Card in the DSC is not compatible with that in your PC. In this case do not format your card, just complete it with complimentary software.

• How much memory capacity do I need? • Which type of memory is compatible with my system? • How much does the memory cost? • It comprises CE, FCC and VCCI, and a certificate is then issued. • How fast is the memory?

Yes, the dimension of SD card is similar to MMC card; therefore, the slots of both cards are also the same.

Although SD is a standard interface, it is merely a storage medium. It will become non-compliant with applications due to the different formats under different OS. RITEK Cards are formatted under PC OS before shipping, so that work without fail. Should your card be formatted under a specific PAD, it has to work under such environment. This situation is the same everywhere.

Controller, circuit design and flash memory will affect a SD card performance. We have assured that all cards are compatible with standard of the spec of the SDA, but we cannot assure that all have the same speed.

All Ridata SD cards meet the specifications for their type of memory and will work w/ any device also meeting specification. Manufactures of devices that use the memory can specify capacity limitation and can fall outside of the specifications. You can contact manufacturer for compatibility questions also can Ridata technician for assistance.

Windows Me and Windows 2000 use delayed writes so the OS may stil be writing data to the card even after it appears to be completed. We suggest you right click on the drive letter for the reader and choose “Eject”You can now safely remove the card.

Please do the following actions no matter what's solution of SD card: 1. Using a card reader to identify this SD card, view the property to make sure the file system is FAT format. If not, please use the card reader or Digital Camera format the card again. 2. Using a card reader to identify this SD card, view the device by browser to make sure it shows removable disk. If not, please refer to Ridata`s return policy 3. If the above actions cannot solve the problem, the SD card may have compatibility problem with the device. Please contact Ridata technician for assistance

Cameras must be SDHC compatible to use SDHC cards, though most SDHC compatible cameras should be able to use regular lower capacity SD cards. However SDHC is not backward compatible with SD and that means a 4GB SDHC card will not work in a camera designed only for use with SD cards. Most new digital cameras will be SDHC compatible, but not all current cameras are. For example the Canon Powershot G7m A71, A630, and A640; Nikon D40 are SDHC compatible. Canon just released firmware updates for the 1Ds MK II, 1D MKII N and 1D MK II to make them SDHC compatible.

The SD Association has created and defined 3 speed classes to help users identify speed and performance capabilities/ minimum requirements of SD/SDHC cards and the host products. The SD speed class ratings specify a minimum sustained write speed for SDHC cards. Class 2: 2MB/s; Class 4: 4MB/s; Class 6: 6MB/s. Users can look for the speed class logo to identify the performance class of your memory cards and host devices.

Most digital cameras and PDAs recognize only FAT16 memory cards. When you format your card with a card reader, please select "FAT" format. You can also format your card with your digital camera or PDA first.

To support the higher capacity needs, SD cards are now requiring a different design. The new SD 2.0 specification support 4GB and up is called Secure Digital High Capacity (SDHC). The SD Association has created and defined 3 different speed classes to help you identify speed and performance capabilities/ minimum requirements of SDHC cards and their SDHC host products. For the detail on the SD 2.0 specification you may also refer to http://www.sdcard.org.