busTRACE 10.0 can capture I/O activity to devices that process Command Descriptor Blocks (CDBs) such as hard drives, CD/DVD/BD drives, tape drives, and more. It can also capture all low-level USB Request Blocks (URBs) that Windows generates.

The very first time you run the busTRACE Capture Client, you will be asked to select which types of I/O activity you are interested in capturing. You can also get to this option from the Configure button on the initial busTRACE Capture Client screen.

Select the types of I/O activity you are interested in capturing and then click on Next to continue.

All low-level storage class I/O activity (i.e. CDBs, SRBs, IOCTLs)

Windows supports a wide variety of storage class devices such as hard drives, tape drives, CD/DVD drives, jukeboxes, and more. To communicate with these devices, Windows drivers build up SCSI Request Blocks (SRBs). Do not be confused by the term "SCSI" within the term SCSI Request Block. SRBs are used to communicate with devices across a wide variety of bus architectures including SCSI, ATAPI, ATA, SATA, Fibre Channel, 1394, USB, iSCSI, SAS, RAID, and more. Details on the SRB structure can be found in Microsoft's Windows Driver Development Kit.

Embedded within an SRB is a Command Descriptor Block (CDB). A CDB defines the command and its options being sent to a device (e.g. Test Unit Ready, Request Sense, etc.). The device's command specifications define which commands are supported and their behavior. Command specifications are typically available through industry standards organizations such as the Incits T10 Technical Committee (http://www.t10.org).

By placing a checkmark next to this tree's sub-items, you are configuring busTRACE to capture all storage class I/O activity on the specified bus architectures.

All low-level USB bus activity (i.e. USB Request Blocks, URBs)

Windows supports a wide variety of USB devices such as keyboards, mice, cameras, network adapters, hard drives, and more. With the proper software, there are no limits as to the types of USB devices you can hook up to your computer. USB software drivers set up USB Request Blocks (URBs) to send requests to the USB controller driver which then sends them to the actual USB device. The URB structure defines a format for all possible commands that can be sent to a USB device.

By placing a checkmark next to this option, you are configuring busTRACE to capture all low-level USB I/O activity on the computer.

busTRACE is especially powerful if you want to capture I/O activity on a USB storage class device such as a flash drive or CD/DVD device. Not only will you be able to see all the SRBs/CDBs being sent to the device, but also the underlying URBs that will be built and sent to process the SRBs/CDBs.

Options

Selecting the Options button brings up our busTRACE advanced driver options.

Advanced Driver Options

Enable Advanced Filtering

Some older Windows device drivers bypass the normal driver layered model of Windows and send their I/O requests directly to the controller / port driver. If a driver bypasses the I/O stack, busTRACE would normally not see all the I/O being send to the device. With advanced filtering enabled, we look for drivers that bypass the I/O stack and ensure that we are able to capture their I/O activity. You should not need to disable this option.

Capture Unfiltered Device IRPs

This options is for use by busTRACE technical support. The option should be left disabled.

Disable Pause Capture Feature

This options is for use by busTRACE technical support. The option should be left disabled.

Storage Device Options

Cache Device Inquiry Data

Enabling this option will cause busTRACE to send an Inquiry CDB to each detected storage device and cache the results in the busTRACE capture file.

Cache Supported Security Protocol List

Enabling this option will cause busTRACE to send a Security Protocol In - Supported Security Protocol List CDB to each detected storage device and cache the results in the busTRACE capture file. This CDB is only sent if busTRACE detects the device is SPC-4 (or higher) compliant.

Cache IEEE 1667 Probe Silo

Enabling this option will cause busTRACE to cache the IEEE-1667 Probe Silo on any device where such support is detected.

Cache CD/DVD/BD Feature Descriptors Enabling this option will cause busTRACE to send a Get Configuration CDB to each detected CD/DVD/BD device and cache the results in the busTRACE capture file.

USB Device Options

Cache USB Descriptors

Enabling this option will cause busTRACE to enumerate all of the USB descriptors present in each detected USB device.

See Also: