Odd CF card issue at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon EOS Crop Sensor for HD

Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.


Reply
 
Thread Tools Search this Thread
Old July 28th, 2010, 08:15 AM   #1
Major Player
 
Join Date: May 2006
Location: Boston, Massachusetts
Posts: 425
Odd CF card issue

I've had my 7D for two weeks, and couldn't be happier. I've got a SanDisk 8gb CF card.

I updated the firmware on my 7d from 1.2.1 to 1.2.2. Then reformatted the card. Didn't need to, just playing around with the camera and the card ( I had already copied all the pictures on the card to my pc).

I then shot a little bit of video with the camera. I took the CF card out of the camera and put in the card reader - and the pc couldn't read it. On my laptop I got an error message saying 'semaphore timeout has expired'. Tried different USB ports, same thing.

Googling 'semaphore timeout has expired' suggested the card is corrupted. I guess that's possible, I've only had the card for two weeks.

Curiously, the camera still records to the card, and when I attach the camera to the computer, I have no problem getting stuff off the card. Did the camera format the card with some weird format Windows can't read?

The card worked fine without being formatted in the camera - is formatting in the camera a no-no?
Dennis Stevens is offline   Reply With Quote
Old July 28th, 2010, 10:01 AM   #2
Contributor
 
Join Date: Jan 2003
Location: Kansas City, MO
Posts: 4,449
Formatting in the camera is good. Some say you should always do that. Have you tried a different card reader? The fact that it works from the camera to the computer seems to imply the card reader is bad.
Bill Pryor is offline   Reply With Quote
Old July 28th, 2010, 10:17 AM   #3
Major Player
 
Join Date: May 2006
Location: Boston, Massachusetts
Posts: 425
My next step was to get a new card reader, maybe a new 4gb card.

Googling the error message, I found a few forums where people said these cards fail frequently. One person said they only buy 4gb cards, since a corrupted 32gb card would be a waste of money.

Is that other people's experience? 'Often' is a subjective term, but do other people keep a bunch of 4gb cards around, and avoid larger sized cards? I know the camera stops when the file is 4gb, but I was thinking I'd have two 16gb cards, and fill one with 4gb chunks. While that's being offloaded, pop the other card in.
Dennis Stevens is offline   Reply With Quote
Old July 28th, 2010, 11:45 AM   #4
Trustee
 
Join Date: Nov 2006
Location: San Angelo Texas
Posts: 1,510
SanDisk CF and SDHC media seem to have the fewest problems. You may have gotten one that's bad so I'd suggest buying another like it (from B&H or from amazon where amazon is the actual seller) and send the bad one back to SanDisk since you've only had it two weeks.

However, if you got it as a "bargain" (such as off ebay) and not from a reputable dealer like B&H be prepared...SanDisk may come back with a "Not one of ours" response. There are a lot of counterfeit SanDisk media out there especially on ebay. I've even seen some listings on amazon from associated sellers that look questionable to me.

My SanDisk 8GB Extreme CF cards were purchased from B&H. I "choked" a bit at the price but placed the order, each time for just one card until I had 3 of them. But I've not had a corrupted or lost file yet.
Bruce Foreman is offline   Reply With Quote
Old July 28th, 2010, 12:15 PM   #5
Major Player
 
Join Date: May 2006
Location: Boston, Massachusetts
Posts: 425
Got my CF card at BestBuy.
Dennis Stevens is offline   Reply With Quote
Old July 28th, 2010, 12:37 PM   #6
Inner Circle
 
Join Date: Jan 2004
Location: Miami, FL
Posts: 2,933
We're using 32GB Sandisk cards and haven't had any issues yet (knock on wood). When we switched to DSLR's we did a lot of research on the cards and Sandisk seemed to be the #1 choice, and we never any information that larger cards were more prone to issues. So take that for what it's worth.

Regarding 4GB cards, I think they would work fine depending on what you are shooting. We shoot primarily weddings, so a 4GB card is not ideal since we would have to switch cards far too often. But if you're shooting set shots for a controlled production I could see a 4GB card working just fine.
__________________
Black Label Films
www.blacklabelweddingfilms.com
Travis Cossel is offline   Reply With Quote
Old July 28th, 2010, 01:32 PM   #7
Inner Circle
 
Join Date: Nov 2005
Location: Elk Grove CA
Posts: 6,838
This card business is kind of interesting, in terms of what result people are getting.

Last year when I bought my Canon 5d, I bought 2 8 gig and 2 16 gig, Kingston cards, that I am sure many thought were not suitable. I have never had an issue with them.

Similarly, I recently bought the T2i, and outfitted it with lower class SDHD card , that seem to do the duty, despite higher class recommendations. Not noting any issues. Sometimes I wonder if manufactures make the same card for all levels, but label and price them differently..
__________________
Chris J. Barcellos
Chris Barcellos is offline   Reply With Quote
Old July 28th, 2010, 08:31 PM   #8
Major Player
 
Join Date: May 2006
Location: Boston, Massachusetts
Posts: 425
Looks like it was the card reader. Didn't think they'd be that delicate.

But I'd rather it was the card reader than cards full of uncopied footage going down the crapper.
Dennis Stevens is offline   Reply With Quote
Old July 29th, 2010, 12:18 PM   #9
Inner Circle
 
Join Date: Jan 2004
Location: Miami, FL
Posts: 2,933
Thanks for the update. Glad it was just the reader.
__________________
Black Label Films
www.blacklabelweddingfilms.com
Travis Cossel is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon EOS Crop Sensor for HD

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:01 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network