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Canon SLR Memory Card Capacities

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Canon Tech Bulletin TB 012606 — SD card capacities


Maximum SD card size: 2GB



Mark II N

Digital SLR


While all versions of the EOS-1D Mark II series (including EOS-1Ds Mark II) have been able to routinely work with large-capacity Compact Flash cards, there is an issue with the smaller SD type memory cards affecting all of these cameras.


SD memory cards larger than 2GB WILL NOT work in any EOS-1D series camera. This includes the recently introduced 4GB SD cards that are now coming onto the market.


The basic reason for this is that among SD card manufacturers, there is industry-wide standardization on how data is accessed on cards 2GB and smaller. However, for whatever reason(s), this has not happened (to date) with SD cards larger than 2GB. And apparently, there are differences in how the data is accessed on these cards. This can cause irregular operation.


Some additional points for Canon staff, dealer sales people, and end-users

to be aware of:


• Current EOS digital SLR's — EOS 5D, EOS-1Ds Mark II, EOS-1D-1D Mark II N (and EOS-1D Mark II), EOS 20D, and Digital Rebel XT — have been tested with

Compact Flash cards of 6GB and 8GB sizes, and these have performed without



• SD cards up to 2GB in size have worked reliably. However, as stated above, SD

cards of 4GB will not work, as of January 2006.


• Microdrives up to 8GB have been tested on these cameras, and have passed

Canon, Inc's test procedures.


• Seagate 8GB Photo Drives (similar to Microdrives):

With EOS 20D or Digital Rebel XT cameras running latest firmware, these cards

can perform very slowly. Seagate is aware of this issue, and is expected to upgrade the driver firmware for the cards at some point in the future. Customers should be directed to check Seagate's web site, or to contact Seagate if they have on-going problems.


High-capacity CF cards were not commercially available for testing when older EOS cameras were in development. Accordingly, Canon recommends CF cards of 4GB or less with the following cameras:




Original EOS Digital Rebel (problems can occur with 4GB Microdrives)


Finally, please note that original EOS-1D, D30, and D60 were not FAT32 compatible, and therefore must be used with 2GB or smaller CF cards.


January 26, 2006 Product Support & Market Education Department

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