cf going and sd coming in for SLRs

[Haeretik]

Originally Posted by SJH Foto

Sorry guy-they have 16GB SD cards now. You can buy 8GB cards at Wal-Mart.

True but I've CF is at 32, 48 and 64GB capacity now as well... all I've seen in stores though is 16's...

FWIW, the XSi is SD only afaik.

[waffles]

Originally Posted by SJH Foto

Sorry guy-they have 16GB SD cards now. You can buy 8GB cards at Wal-Mart.

That doesn't mean that SD card technology is made to work at sizes that big.

[SJH Foto]

FWIW, the XSi is SD only afaik.

What does that mean? Sorry I don't know the abbreviations.

[inkista]

FWIW: for what it's worth
XSi: Canon 450D.
SD: Secure Digital
afaik: as far as I know

SDHC and CF both have the same theoretical upper-limit (via FAT32 addressing): 2TB, so we're nowhere near maxing out on capacity in either format. I think, however, that SD has a chance at edging CF out, as it's already the most common format in P&S cameras, and eliminates the problem of bent pins.

I use SDs in my G9, and CFs in my 350D, and honestly, I'd prefer using just the one format between both cameras, so going to a 450D with SD would be nice for me.

[Doug Pardee]

Originally Posted by inkista

SDHC and CF both have the same theoretical upper-limit (via FAT32 addressing): 2TB

The SDHC specification (SD 2.00) only allows up to 32 GB. A new specification will be needed for more than that. Presumably such a specification would be incompatible with current SDHC equipment (as SDHC is incompatible with older SD equipment).

The CF hardware interface is based on parallel ATA, and so is only able to address up to 128 GB. Some sources call the limit 137 GB, but that's based on decimal G rather than binary G… hard drives are typically rated in decimal G, while CF cards are typically rated in binary G (or we'd have 17 GB cards). A new "CFast" specification based on serial ATA (SATA) is in the works, but it is incompatible with current CF equipment.

[SJH Foto]

You lost me already

[inkista]

Doug--thanks! I didn't know about those limits. The thing is, that if, say, a 3.0 SD spec comes out with yet-more-expanded address space, it's likely to still be backwards-compatible. While SDHC cards can't be used in SD-only cameras, SDHC-capable cameras can still use both SDHC and SD. I'd expect future developments to be the same--not to leave us with orphaned cards, and to further encourage us to upgrade our gear .

CF may have an edge with an open standard. But then, so does MMC...

SJH Foto, don't worry about not comprehending the geekspeak. It just means you have a life.

[daft_biker]

IIRC the higher capacity cards are SDHC rather than SD. Am not sure if SD devices will take SDHC cards but I think SDHC devices work with SD cards.

Chances are the 450D and newer compacts are SDHC.

[inkista]

Yeah, the "HC" in SDHC stands for "high capacity." And yes, the new cameras are mostly SDHC. The problem is typically if you buy an SDHC card that's ≥4GB, and try and stuff it into a camera that only understands SD.

[Sneaky0704]

FAT32 can actually address 8 terabytes of space using 2^(28-1) clusters per partition on a hard drive.

As for SD, I have a microSD car in my phone right now that is 4GB and is 1/4 the size of a standard SD card.