On Thu, Dec 21, 2006 at 08:47:47PM +1100, J and K Messervy wrote: > You can use SDHC cards which I believe go up to 4 gig.
The SDHC spec allows for card capacity up to 32 GB. There are already a few 8GB cards on the market - Pretec was the first, but Transcend soon announced one, followed by ATP, A-DATA, Toshiba, .... They're not as fast as the regular SD cards yet - the Transcend card is only rated at 80x, vs. the 150x available in non-SDHC. I must admit, though, that it's not easy to do comparisons between the speed of the cards - SDHC introduces a new speed rating system. I believe that in the old rating a "1x" card could transfer data at 150k bytes/second. That means that an 80x speed rating would be equivalent to a transfer rate of 12MB/sec. (A quick back-of-the envelope check validates this; the K10D is reported to be able to shoot about one (17MB) RAW file per second in a sustained burst, which matched up quite well with it's reported ability to make use of cards rated at 133x or 150x). But the Transcend 8GB SDHC card is only rated as an SDHC Class 2 device (which appears to only require transfer speeds of 2MB/sec, from how I read the SDHC specifications). Similarly the Toshiba 8GB SDHC card (the first one that claims to meet the SDHC class 4 requirements of 4MB/sec) reports much higher transfer rates in their press release - they claim 20MB/sec, which is equivalent to 133x under the old SD speed rating system. Are you as confused as I am? -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
