Solution:

The mechanism of IPC-622 and SPC-520 is design to accept 5.25" devices such as CD-ROM or mobile rack. If you wish to install 3.5" HDD or FDD on these systems, you need additional beacket for them. These brackets are available from Advantech and please contact with our sales to have. Following is the part number for your request. For SPC-520, we will design a special bracket to hold both slim CD-ROM and FDD together. 1. 3.5" to 5.25" HDD bracket - P/N: T0371N0100 2. FDD to 5.25" bracket - P/N: T0317N0200