ExpressDisk™ Host Drivers

The MCCI ExpressDisk Host Drivers are now distributed exclusively by Prolific Technology, Inc. For sales and licensing information, contact MCCI at sales@mcci.com.

The MCCI ExpressDisk Host Drivers give system and device manufacturers an easy way to increase storage throughput. The MCCI ExpressDisk BOT Driver will speed up any USB 2.0 or USB 3.0 storage device that uses the original USB Mass Storage Class "Bulk Only Transport" (BOT) protocol. The MCCI ExpressDisk UASP driver will further accelerate storage devices implemented using the newer USB Mass Storage Class "USB Attached SCSI Protocol" (UASP). The MCCI ExpressDisk Switch driver allows dynamic selection of legacy, ExpressDisk BOT, or ExpressDisk UASP drivers on a device by device basis.

The MCCI ExpressDisk UASP Driver is a complete replacement for Mass Storage Class and utilizes the Windows-provided SCSIport/Storport Driver to achieve maximum data throughput speed. The MCCI ExpressDisk UASP Driver provides 300% of BOT throughput.

The MCCI ExpressDisk UASP Driver takes full advantage of USB 3.0 features:

  • Streams
  • Full-duplex transport
  • Overlapped operations
  • Native Command Queuing (NCQ)
UAS_data

The MCCI ExpressDisk BOT Driver utilizes the Windows-provided SCSIport/Storport Driver Architecture and the BOT protocol to deliver better performance than the standard Windows drivers normally provide. In addition to allowing a larger maximum transfer size than the standard Windows USBMASS driver, the driver combines multiple Read/Write requests into a single request to achieve the highest throughput. Unlike other "Turbo Mode" drivers, the MCCI ExpressDisk BOT driver is not a filter driver; instead it connects directly to the Windows SCSI system to acheive maximum throughput without sacrificing reliability.

MCCI ExpressDisk BOT driver provides 30% or better performance when compared to other BOT drivers.

Benchmark Test Results for USB 3.0 Host

MCCI ExpressDisk comparison w MSFT
BOT Driver
Maximum Read Speed, MB/s
Maximum Write Speed, MB/s
MCCI
319
303
Microsoft
181
137

ExpressDisk Driver Technical Notes

MCCI ExpressDisk

The MCCI ExpressDisk UASP Driver and the MCCI ExpressDisk BOT Driver are OS-version neutral. MCCI’s Storport miniport driver is loaded for Windows Vista SP1, Server 2003, and later Windows versions. MCCI’s SCSIport miniport driver is loaded for Windows XP and Vista without SPs.