Best Canon EOS 40D Memory Cards

By Nathaniel Stephan
Last Updated: October 27, 2019
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Best Canon EOS 40D Memory Cards

The maximum size Compact Flash memory card that is compatible with the Canon EOS 40D is 137GB. Due to what you can buy, that means the largest card you can use is 128GB.

The size limitation comes from the original CF card specification. Another limitation can be the FAT32 file system. Older os's capped the partition size at 32GB.

If you don't want to read explanations of specifications, my Recommended CF card is:

SanDisk Extreme 32GB CF Card

  • Read speeds up to 120MB/s.
  • Write speeds up to 85MB/s.
  • Water, x-ray, & shock proof.

Once you have a working memory card, expand your creativity with another lens. Check out the 7 Best Canon 40D lenses.

The best value card is going to be either 16GB or 32GB. Larger or smaller cards are going to be more expensive per GB.

A professional card isn't going to add a noteworthy amount to the price. Having a high-speed card will remove the need to buy another card with a future camera upgrade.

Recommended CF Cards

SanDisk Extreme 32GB Compact Flash Card

  • Read speeds up to 120MB/s.
  • Write speeds up to 85MB/s.
  • Sustained data recording of 20MB/s.
  • Water, x-ray, & shockproof.

SanDisk Ultra 16GB CompactFlash Card

  • Speeds up to 50MB/s.
  • Excellent reliability and value.
  • Ideal for mid-range DSLRs.

Lexar Professional 1066x 32GB CompactFlash Card

  • Transfer speeds up to 160MB/s.
  • Video Performance Guarantee sepc VPG 65.
  • Limited lifetime warranty.

SD to Compact Flash Card Adapter

  • Cheap option if you already have an SD card.
  • Supports SD, SDHC, SDXC cards with a 128GB max.
  • CF Type 1 size.
  • A MicroSD version is available.

Card Reader

UGREEN CF Card Reader

The UGREEN 4-in-1 card reader is what I use with my Compact flash cards.

The UGREEN reader connects over USB 3.0. USB 3.0 transfer speeds will be faster than the Canon 40D.

The card reader also supports the following card types:

  • CompactFlash Cards
  • SD, SDHC, & SDXC Cards
  • Memory Stick (MS), MS Pro, MS PRO-HG, & MS XC DUO
  • MicroSD, Micro SDHC, & Micro SDXC Cards

Compact Flash Card Types

Two separate types of CF cards exist. A card can be either Type I or Type II.

The only difference between the types is the thickness of the cards. All other dimensions of the cards are the same.

  • Type I - 3.3mm thick
  • Type II - 5mm thick

The Type II spec made it possible to use Microdrives with the Canon 30D. A Microdrive was just a compact mechanical harddrive.

Compact Flash cards had small storage capacities when they were first released. Microdrives allowed for larger amounts of storage.

Microdrives are no longer produced. Due to their mechanical nature, the drives had a high failure rate.

Another use of the Type II slot is for CF card adapters. An adapter makes it possible to use an SD or MicroSD card in a CF slot.

Avoiding Card Read Errors

One of the most common problems with cameras that use Compact Flash cards are bent card reader pins. When a pin is bent, you may see any of the following errors:

  • Err 02
  • Err CF
  • No CF

To avoid bent pins, never force a Cf Card into the Canon EOS 40D. The additional space for a Type II card can allow for a Compact Flash card to end up being misaligned.

If the card does not easily slide into the card reader, remove it and check the alignment of the card. Also, check the card for any damage.

If everything looks fine, carefully line up the CF card and try inserting it again.

Related Cameras

The best Canon EOS 40D memory card can also be used in the following cameras:

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