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Canon Issues File Corruption Warning on Sandisk CFast for EOS-1D X II DSLR Owners

Canon, noting a problem with file corruption that can occur when certain SanDisk CFast cards are used with its new high-end DSLR camera, has issued a warning concerning the use of the Sandisk’s drives.

Sandisk CFast memory card

Sandisk CFast memory card

The Canon EOS-1D X Mark II DSLR camera, the company’s new flagship model, was launched in April, 2016. It features a new 20.2MP CMOS sensor with Dual Pixel AF, and uses a pair of Dual DIGIC 6+ processors to capture 4K video and shoot continuously at up to 16 fps. The camera has a native ISO of 100-51200, expandable to 409600.

Canon said the file corruption issue occurs with the last few images recorded just before the camera is powered off. The company suggested that before powering the camera off, users take extra shots because the shots taken immediately before the camera is powered off may experience the corruption. It apparently does not affect the images taken before the extra shots were taken.

Here is a list of the affected cards. The “xxx” at the end of the product number varies depending on the sales region:

SanDisk Extreme PRO CFast2.0 64GB (SDCFSP-064G-xxx)

SanDisk Extreme PRO CFast2.0 128GB (SDCFSP-128G-xxx)

SanDisk Extreme PRO CFast2.0 64GB (SDCFSP-064G-xxxA)

SanDisk Extreme PRO CFast2.0 128GB (SDCFSP-128G-xxxA)

SanDisk Extreme PRO CFast2.0 64GB (SDCFSP-064G-xxxB)

SanDisk Extreme PRO CFast2.0 128GB (SDCFSP-128G-xxxB)

Rear of ​Canon EOS-1D X Mark II DSLR camera

Rear of ​Canon EOS-1D X Mark II DSLR camera

Canon said both Raw and JPEG files are affected, but the number of corrupted images varies according to the compression mode used. When shooting Raw, Canon recommended recording just one extra shot, but shooting small sized JPEGs will require eight extra shots to protect other images on the card.

Canon said it has not confirmed that video is affected by the card problem and said that both still images and video recorded to CF cards are not affected.

The statement makes clear that the problem is caused by SanDisk's cards, not by the camera. Canon said it may issue a firmware update in early July to address the problem.

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