New sd memory card doesn't work in my digital camera

No. The S5i works with SD cards, which max out at 2GB. It will not work with higher-capacity SDHC cards.

Yes it will but that's the limit. Don't go out and try use an SDHC card of 4gb and higher.

No. The S40 works with SD cards, not with SDHC cards. You have to use SD cards, 2GB and smaller.

The S5i uses SD cards. This means you can use microSD cards with an adapter. However, your 8GB card is actually a microSDHC card, which with the adapter appears to the camera as an SDHC card. SDHC cards are electronically incompatible with SD devices and will not work. You need to use SD and/or microSD cards, which max out at 2GB in size.

HI there there try to download the windows 7 camera driver from pentax website. It will start work then. Another way is remove the memory card & put in in a card reader then you can also transfer all photos from card to computer For further help ask me . Thanks.

No the Pentax Optio S5i does not support an 8gb memory card.

8gb would be an SDHD card, the S5i came out before SDHD so it does not support them.

Standard Secure Digital Cards come up to 4GB in size so you could use one of these. The highest standard card I have is 2gb and that is fine in mine.

My S5i locks up if you put an SDHD card in.

The only firmware update that Pentax supply does not effect this, SDHD needs different hardware.

Have you tried formatting the card in the camera first?

• Supported Flash Memory: SD Memory Card Integrated Memory: 23 MB
• yes you can used the memory card with this.
  

Look at your memory card. SD cards have a slide switch along one edge. The position farthest from the metal contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.

The S5z is limited to SD cards, 2GB and smaller. The speed doesn't matter, but larger cards will not work in this camera.