简单的说下
该10GB微硬盘采用了两块5GB微硬盘叠加的方法
在电脑上共产生2个盘符，每个5GB
采用了USB HUB芯片，安国AU6254
分出两路USB，到USB to IDE控制芯片PL-2506
说白了，这个微硬盘就是由两块各自独立的5GB移动微硬盘和一个USB HUB集线器组成
所以我们看到了3个晶振
安国AU6254 USB HUB集线器 性能介绍：
＊低功耗，芯片工作电流小于10MA，具节电功能：当USB口没有连接外部设备时，芯片不会工作，只有联接了外接设备时，芯片才全部工作
降低发热量。
＊外围线路元件少，低成本：DM，DP数据线的上拉电阻和下拉电阻包果在芯片中。
＊48PIN-LQFP和64PIN-LQFP两种封装
＊单芯片USB Hub Controller及所有处理器。
＊内建1.8V调整器，5V工作电压。
＊提供4个USB接口，支持USB2.0兼容1.1标准
＊支持数据传输，支持高速480Mbps；全速12Mbps；低速1.5Mbps。
＊支持热插拔，使用简便。
＊最多连接255个外设备，符合标准USB2.0规范
＊测试验证级联16个高速U盘量产OK！
PROLIFIC(旺玖) PL-2506The PL-2506 is a single chip USB2.0-IDE bridge controller, which is designed to perform a seamless protocol transfer between the USB and ATA interfaces. It will work with full function at full speed or high speed USB transfer mode. The operating speed mode is determined by the capability of the host/hub to which it is connected. The PIO mode 0 to mode 4, Multi Word DMA mode 0 to mode 2, and Ultra DMA mode 0 to mode 4 are implemented to support difference IDE devices. The chip can communicate with the connected device to select the proper mode to obtain the best performance.
And it is compliant to the USB Bulk-Only Mass Storage Class specification ver 1.0. Since the default driver is supported by most the OS, no additional driver is needed.
附速度测试：
http://bbs.mydigit.cn/read.php?tid=49012
