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It sounds as if you have an SD card reader, not an SDHC card reader. While SDHC cards will fit into SD slots, they are electronically incompatible and will not work. SD devices are limited to cards 2GB and smaller. SDHC cards begin at 4GB and go up to 32GB.
If you a using a card reader that plugs into your PC and it STILL doesn't read from the card, this means that the card itself is defective and needs to replaced. You CAN try using another card reader to see if that helps.
this will say that if win you put the files on it was on a diferant defice that stores the files in a differnt format and the only way to view thim would be on that device your best bet is to press x and go to the folder see if thar is anything in it if it isnot reading it you must reformat it to get it to read it...because it isnot in a readable formate now it may or may not read it on your device...hope ths helps,
becoz then the autoplay of the drive will be activated and it will freez your computer......recomandation is to format the drive in computer not in the cam, or you can open the SD drive frome 3rd party software (total commander), and delete the hidden autorun files.
Please bear in mind, that 4GB cards will most likely be of the newer SD HC (Secure Digital - High Capacity) standard, which is not recognized by older devices that only support the basic SD specifications. You have to try a 2GB card, or look for a non-HC 4GB card, but these are very hard to find.
a 4GB card is certainly HC (High Capacity). What type of flash memory is it?
Be aware that some computers have a different boot sequence. Meaning that some will try to boot from the DVD/CD drive before the hard drive, some will try to boot from a USB device before those. The card being present in the drive could be telling the computer to try and boot from that (which I'm 99% sure is the problem there).
Next is the issue with the card being read. Until I know what type of flash memory it is (SD - Secure Digital, CF - CompactFlash, etc..) this is speculation. I know with SD there is standard SD and SDHC (SD High Capacity). Older card readers are only capable of reading standard SD cards and while they will acknowledge the existance of SDHC because it is the same form factor, it won't know how to read it.
I'm having the same problem with a Transcend 4GB microSDHC card / microSD adapter. I have also found it probably has something to do with the card reader...either the card reader is an SD card reader trying to read an SDHC card OR the card reader is not able to read high-gigabyte SD cards (over 1 GB in some cases).