CFast cannot be formatted on Canon 1DX Mark 2 due to a camera-specific bug. This issue also affects CFast cards from other brands. Formatting may be necessary using an adapter board.

CF cards are older and slower, typically used in older devices. CFast cards are faster and more compact, suitable for professional cameras. CFexpress cards offer the highest speeds and capacities, ideal for demanding applications in modern devices.

To select the right memory card:

1. Check compatibility with your device.

2. Choose an appropriate capacity and speed class.

3. Ensure compatibility with your device's file system.

The capacity of a memory card displayed on the computer might appear lower than its actual capacity due to various factors such as file system overhead, formatting, and marketing practices. File systems like FAT32 or exFAT reserve a portion of the storage for file allocation tables and metadata, reducing the usable capacity. Additionally, marketing conventions often use decimal-based calculations (1GB = 1,000,000,000 bytes) while computers use binary-based calculations (1GB = 1,073,741,824 bytes), further contributing to the perceived difference in capacity.

1. Ensure that the video recording time limit is set, not a fixed duration.

2. If the card format is FAT32, recording stops when it reaches 4GB due to file size limitations. Switching the card format to NTFS or exFAT, if supported, can resolve this issue.

When the CF card is accessed using IDE or SATA through an adapter or extension board, if the CF card is displayed as a local disk, it is in Fixed Disk Mode. If it is displayed as a removable disk, it is in Removable Disk Mode.