Transcend 8gb poswert - Canon PowerShot A630 Digital Camera

Although the Canon Powershot A630 is a great camera, it has an age.
It is made for SD cards and since the A630 saw the world there were several changes with SD cards. The cards grew in size and till 4Gbyte they were called SD card. Nowedays you only can get few 4GByte cards called SD. Soon after the 4Gbyte mark was reached they started to make SDHC cards. that is why most 4Gbyte cards now are also SDHC. Till they reached 32 GByte not much changed, only speed was becoming better. After the 32 GByte the SDXC cards came.

For every step up, the equipment that used SD cards had to be changed. The newer apparatus can use old SD or "lesser" SD cards. The old apparatus only are capable of using SDHC card if a software upgrade is done. But only apparatus close to the introduction of a new card could be upgraded with new firmware. So if Canon never offered an upgrade, you only can use normal SD cards and no SDHC cards. Your Trancend 8Gb card is definitely a SDHC card.
If you want a "Big" card for your Canon, try to buy a Platinum 4GB SD card.Please take care the advert does not say SDHC or SDXC

I had an A630 stolen long ago. It was a wonderful camera. Today I was in a pawn shop and low and behold they had one. Pristine condition. I bought it for $49.00 for my kids. I popped in a 32GB Transcend class 10 SDHC and it works great. Says I have space for about 7500 photos. My wife saw it and stole it. It turns out she loved the old camera also. I have my card formatted as FAT32. Maybe yours is formatted NTFS?