DMA

Direct Memory Access lets a controller move data between hardware and system memory without making the CPU copy every byte. Storage, audio, graphics, and network devices depend on it for high throughput and low latency. Windows manages these transfers through each signed hardware package and can apply Kernel DMA Protection to external high-speed buses on supported systems. That protection reduces the risk of a malicious peripheral reading memory before sign-in. If a Thunderbolt or PCIe accessory stops working after a security or firmware change, check for an updated package from the system maker rather than disabling protection immediately. Faulty DMA handling can destabilize the entire PC, so repeated crashes naming a controller module warrant a rollback.