Cost-effective highest quality memory card for the most demanding needs of professional photographers and the most common uses cases of professional filmmakers Pro speed: up to 3000MB/s write and 3650MB/s read real-world speeds for the most advanced uses cases of professional content creators including fast burst RAW image sequences and high bitrate video recording up to 6K Supportive: fully compatible with a wide variety of DSLR and mirrorless cameras; Compliant: fully meets CFexpress Type B 1.0 2.0 and 4.0 specifications Effective: 256 and 512GB capacities for XQD format cameras that have been updated to support CFexpress Tough: impact bend shock ESD UV ray and x-ray resistant; 3 Year OWC Limited Warranty.