Glyph Capture+ CFexpress Type B 4.0 Memory Card – 256GB

The Glyph Capture+ CFexpress Type B 4.0 256GB is the entry-capacity model in Glyph's Capture+ CFexpress Type B 4.0 range. It combines a PCIe 4.0 x2 interface with Glyph's SteadyIO technology for professional camera workflows that require consistent recording performance rather than headline burst speeds alone.

The 256GB model has lower write and sustained-write performance than the higher-capacity Capture+ cards, so recording-mode compatibility should be checked against Glyph's camera compatibility guidance and the camera manufacturer's approved-media information.

256GB Performance Profile

This exact 256GB model is specified for up to 3700MB/s read, 850MB/s write and 550MB/s sustained write. These figures are capacity-specific and should not be confused with the substantially higher write figures quoted for the 512GB, 1TB, 2TB and 4TB versions.

CFexpress 4.0 Type B / PCIe 4.0 x2

The card uses the CFexpress Type B 4.0 specification with a PCIe 4.0 x2 interface. Glyph also specifies backward compatibility with CFexpress 1.0 and 2.0 devices, allowing the card to be used with compatible earlier-generation Type B equipment subject to host limitations.

SteadyIO Sustained Performance

Glyph's SteadyIO technology is designed to maintain consistent read and write behaviour across large sustained workloads, helping reduce throttling and performance variation during extended recording or ingest operations.

Power-Loss And Thermal Protection

Intelligent power-loss handling is designed to protect in-flight writes if camera power is unexpectedly lost. Advanced thermal and power management helps control heat generation and power draw during sustained operation.

Data Protection And Durability

Built-in overheat protection, ECC, EMS protection, SMART, TRIM and power-management functions are specified alongside EDC/ECC data-resilience features. Glyph also describes the Capture+ cards as resistant to extreme temperature, moisture, dust, shock, x-ray and magnetic exposure.

Camera Compatibility Matters

The 256GB version is not the fastest card in the Capture+ family, and Glyph's own compatibility chart distinguishes between recommended operation and compatibility with reduced recording settings on some cameras. Check the exact camera and recording mode before relying on the card for high-bitrate RAW or high-frame-rate capture.