This is a 2-pack of 64GB SxS-1 Memory Cards from Sony, designed for use in their XDCAM camcorders. Each card features a maximum read speed of 1.2Gb/s, which is about 50% faster than previous SxS models. These flash memory cards feature PCI Express connections, enabling them to fit into an ExpressCard slot for fast data transfer to a computer. Using the FAT file system, record up to 200 min of HQ 35Mbps video, 280 min of SP 25Mbps video, or 260 min of DVCAM 25Mbps video. Using the UDF system, you can capture up to 120 min in HD422 50Mbps or IMX50 50Mbps, 180 min in HD420 HQ 35Mbps, or 220 min in DVCAM 25Mbps. Additionally, a salvage function is built into the system to help restore content damaged by power loss and other factors. The cards are also shock-resistant against 1500G, vibration-proof against 15G, and capable of enduring up to 30,000 insertion/removal cycles.