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General photography questions and answers: Discuss 8gb udma cards ?...CAN SOMEONE PLEASE EXPLAIN THE DIFFERENCE BETWEEN AN 8GB COMPACT FLASH CARD AND AN 8GB UDMA CARD. I INTEND TO ...
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Old 14-12-2009, 18:01   #1 (permalink)

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8gb udma cards ?

CAN SOMEONE PLEASE EXPLAIN THE DIFFERENCE BETWEEN AN 8GB COMPACT FLASH CARD AND AN 8GB UDMA CARD.

I INTEND TO USE MY CANON 7D, IN MOVIE MODE, ASWELL AS PHOTOS, AT CHRISTMAS.

I HAVE READ THAT CANON RECOMMEND THAT YOU USE AT LEAST 8GB UDMA CARDS IF YOU ARE GOING TO USE MOVIE MODE, THEY SAY 4GB CARDS WILL NOT BE ABLE TO WRITE FAST ENOUGH AND THE QUALITY WILL NOT BE THAT GOOD.

I HAVE ONLY GOT A COUPLE OF 4GB COMPACT FLASH CARDS AT THE MOMENT, BUT WANT TO MAKE SURE I HAVE THE RIGHT ONE FOR CHRISTMAS, AS IT WILL BE WITH OUR GRANDCHILDREN.

ALSO CAN I SHOOT BOTH STILL AND MOVIE ON THE SAME CARD, OR WILL I HAVE TO CHANGE CARDS ?

MANY THANKS
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Old 14-12-2009, 20:21   #2 (permalink)
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Re: 8gb udma cards ?

I thought UDMA was just a type of Compact Flash Card
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Old 14-12-2009, 20:32   #3 (permalink)
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Re: 8gb udma cards ?

You can shoot both movie and stills on the same card. Having just gone through this kind of upgrade, I can tell you that the UDMA cards write very fast. I beleave that the UDMA cards would be a good purchase for full HD.
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Old 14-12-2009, 22:27   #4 (permalink)
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Re: 8gb udma cards ?

Yep - UDMA cards have faster read and write speeds - but you need a UDMA card reader to take advantage of that high speed when you transfer to a computer.
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Old 14-12-2009, 23:55   #5 (permalink)
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Re: 8gb udma cards ?

If you are using it in you DSLR you also need to be aware that not all cameras support UDMA cards.

Older cameras are less likely to.

UDMA card are currently available in write speeds around 45-60MB/s whereas older CF cards are available up to about 30MB/s
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Old 15-12-2009, 08:11   #6 (permalink)
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Re: 8gb udma cards ?

UDMA... or Ultra speed DMA, or in its long form, Ultra Direct Memory Access...
What is it....

The ability for a machine to pass information without thinking about it.

Keeping it simple here...
Think this way.... you have on your desk an in-tray, a Pending tray, and an Out tray....
The In tray would be the camera buffer where it assembles the photograph, the pending would be the bit where it "Error checks", the ATA Controller, the Out tray would be the buffer on the memory card

Things come in to the in tray, you look at them, perhaps scan for errors, put the whole "File" together whilst they are in the pending tray, then when your happy, you pass them to the out tray....
DMA picks up the contents of the In tray and Deposits it in the out tray "Without thinking about it", no processing power is used, no error checking is used.
Ultra DMA has not only kicked the In tray out of the way and deposits the stuff in the Out tray directly, it has kicked the whole desk out of the way.....
UDMA allows the transfer of what is in the camera's memory buffer directly to the memory of the card at the fastest speed available...

The thinking is, why bother using the Camera's memory buffer at all?... why cant the camera just connect directly to the memory on the card, and when it has finished assembling one "File", just move on to the next?....
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Old 15-12-2009, 15:30   #7 (permalink)

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Re: 8gb udma cards ?

THANK YOU FOR YOUR REPLIES.
SILVERDRAGON, THANK YOU VERY MUCH FOR YOUR VERY DETAILED, BUT EASY TO UNDERSTAND EXPLANATION. IT HAS BEEN MOST HELPFUL, THANK YOU VERY MUCH

I HAVE BEEN TRYING TO FIND A SANDISK UDMA CARD READER, BUT I ONLY SEEM ABLE TO FIND A LEXAR ONE, WHICH I DO NOT KNOW IF IT WILL BE COMPATIBLE WILL SANDISK CARDS. AS I HAVE ALWAYS USED SANDISK, I AM NOT SURE ABOUT USING LEXAR CARDS, DOES ANYONE USE LEXAR CARDS AND ARE THEY RELIABLE ?
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Old 15-12-2009, 15:39   #8 (permalink)
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Re: 8gb udma cards ?

You don't really need a UDMA card reader - the important thing is how quickly your camera can write to the card, rather than the speed of downloading to your PC.

Having said that, any decent reader should be compatible with any make of card.
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Old 15-12-2009, 16:14   #9 (permalink)

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Re: 8gb udma cards ?

THANK YOU PAUL

ARE LEXAR OK ?
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Old 15-12-2009, 16:31   #10 (permalink)
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Re: 8gb udma cards ?

I prefer SanDisk, but Lexar are reckoned to be good.
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Old 15-12-2009, 17:53   #11 (permalink)
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Re: 8gb udma cards ?

Got my Sandisk one on e-bay for under 30, used but VGC and not very old.

FWIW - I bought a cheap multi-card reader for my Son and it said on the ad and in the papewrwork that it would not handle SDHC cards - only SD, so if you do have any SDHC cards it is something to be aware of.

Silky is right that the biggest advantage is in the camera, but it is handy to have a fast download to the computer too.
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Old 15-12-2009, 18:24   #12 (permalink)
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Re: 8gb udma cards ?

I have a couple of these and they work a treat. Also compatible with SDHC.

Hama USB 2.0 Card Reader - 35 In 1: Amazon.co.uk: Electronics & Photo
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Old 15-12-2009, 18:51   #13 (permalink)
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Re: 8gb udma cards ?

There is a Lexar UDMA card reader at Amazon too

Lexar Professional UDMA Dual Slot USB 2.0 Reader: Amazon.co.uk: Electronics & Photo

Reads UDMA CF/ CF/SD/SDHC Cards and is dual slot and USB2 compatible. That would do everything you need woody and will also work with your Sandisk (and other cards).
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Old 15-12-2009, 18:57   #14 (permalink)

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Re: 8gb udma cards ?

THANK YOU GRAHAM
THANK YOU PAUL

I DID NOT THINK OF LOOKING FOR ONE ON EBAY, BUT I WILL CERTAINLY HAVE A LOOK NOW.

I HAVE DONE SEVERAL SEARCHES FOR A SANDISK UDMA READER, BUT JUST KEEPS COMING UP WITH THE LEXAR ONES
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Old 15-12-2009, 19:12   #15 (permalink)
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Re: 8gb udma cards ?

That one that Steve flagged up looks good

Silky's one is the value for money option.

The cheap multi card reader I got my son was 2.50 - and buy one, get one free!! But he does not need UDMA or SDHC
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Old 15-12-2009, 20:39   #16 (permalink)

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Re: 8gb udma cards ?

STEVE, THANK YOU, I HAVE JUST ORDERED THAT ONE FROM AMAZON.

GRAHAM THANK YOU.
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Old 15-12-2009, 21:24   #17 (permalink)
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Re: 8gb udma cards ?

Let us know how you get on with it when it arrives
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Old 15-12-2009, 22:11   #18 (permalink)

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Re: 8gb udma cards ?

WILL DO STEVE, THANK YOU
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