Okay, let's try to figure out the category for this bug report. The user provided a bug where an assertion failed when attaching a USB MSD device in QEMU. Looking at the details: the program is qemu-system-i386, and the command line includes various USB-related flags like -usb, -fda, -drive, -device usb-storage, etc. The error occurs in hcd-uhci.c at line 968, specifically an assertion failure related to a TD_RESULT_ASYNC_START. I know that QEMU has different components. The USB handling is part of the hardware devices, particularly under "peripherals." Since the bug is about attaching a USB device and it's failing during the USB storage setup, it relates to how peripherals are handled in the emulator. Other categories like "device" or "graphic" don't seem as specific here. "Peripherals" covers all I/O devices, including USB, so that fits best. The bug involves an assertion failure when attaching a USB device, which falls under the handling of peripherals in QEMU. **peripherals**