CompactFlash Card Questions

[Rekd]

I've got two cards for my 7D, a Sandisk Ultra CompactFlash card. It's 4 gigs and runs 30mb/sec. I spent about 60 bucks on it I think.

I also recently bought a SanDisk Extreme III CompactFlash card that was less than half the price and also rated at 30mb/sec. I noticed when I shoot video on this card it stops every few seconds during playback (about every 5 or 10 seconds) I think because it's not writing fast enough.

The first card I listed doesn't do that.

I was looking at other cards and found a Lexar Professional UDMA Flash memory card - 16 GB CompactFlash Card for a little over a hundred bucks and the speed rating is not listed as mb/sec, it's listed as 300x. I want to get a bigger card but I want it to be fast enough so it doesn't have problems when I'm shooting video like the Extreme III card above.

Is the Lexar card a good card for the 7D? And how fast is 300x??

TYIA.

 

[usayit]

I also recently bought a SanDisk Extreme III CompactFlash card that was less than half the price and also rated at 30mb/sec. I noticed when I shoot video on this card it stops every few seconds during playback (about every 5 or 10 seconds) I think because it's not writing fast enough.

Where were the two CF cards purchased? Just asking since SanDisk CF cards have been widely counterfeited.

 

[Rekd]

The Extreme III card was bought at Radio Shack and I think the other was bought at Best Buy. I'll ask the wife, she got the other one.

 

[KmH]

And how fast is 300x??

TYIA.

The base rate is 150 kB/s: So, 300 * 150 kB/s = 45 MB

 

[Shockey]

I am fairly sure the Lexar UDMA is the latest fastest version.