The Redfly has two USB ports that can be used to connect various peripherals. Generally the Redfly supports the following USB peripherals:
1. Flash drives generally worked if they were formatted with FAT32
2. Flash card readers generally worked including readers with multiple slots
3. USB mouse – selected applications can take advantage of the scroll wheel so your mileage will vary
4. USB hubs are not supported – You can use one however only the first device that is plugged into the hub is available to your Redfly. However you can use the Redfly to charge more peripherals this way. Just be careful not to exceed the amount of power that the Redfly can output and you should be aware that this will reduce your battery life.

Here is a list of USB peripherals I have tested with it:
1. Aptiva 8GB flash drive. However clicking on Start – Settings – System – Memory displays the device. However the ATT Tilt froze and rebooted.
2. Kingston DataTraveler Micro Reader flash drive (1g internal, 1g micro SD). Also, if the micro SD slot is empty the Redfly only sees the internal drive.
3. Lenovo 2GB flash drive
4. Kingston Mobile Lite with a 1GB SD, 2 GB Mini SD and 1 GB Micro SD
5. Memorex 4 GB Travel Drive (hard drive)
6. Kingston Data Traveler Elite 1GB
7. Kingston DT Mini 1GB
8. Micron Lexar 512MB
9. Sandisk Cruzer Titanium 2GB
10. Microsoft wireless notebook optical mouse
11. Microsoft Intellimouse Explorer
12. Mini optical mouse – FCC ID: HTM-37WT
13. Fellows/Stowaway Keyboard
14. HP multimedia keyboard – the USB hub worked with a Microsoft wireless notebook optical mouse

The following USB devices did not work:
1. 100 GB NTFS hard drive
2. Kingston Secure DataTraveler – does not support the Cdrom or the x86 driver
3. Creative MuVo TX 128 mb did not work.
4. USB hubs – only the first storage device or mouse that is plugged into the hub is recognized
5. Mini optical 3d mouse

Usage Notes:
1. The names of the flash drives are Remote Storage, Remote Storage2 and Remote Storage3.
2. The storage recognized was FAT or FAT32 format. I was unable to access NTFS file systems.
3.  recommend waiting at least 15 seconds after saving information to a flash drive to ensure that the information is written complete and avoid possibly corrupting the flash drive.
4. User must be careful! If Windows Mobile does detect the flash drive correctly, it will prompt to format it! Once it is formatted, the data stored on it is gone.
5. For USB card readers, you need to insert the card prior to inserting the card reader in the USB slot.
6. While you can use a USB extension cable, I do not recommend doing so to reduce possible issues with interference.
7. While you can open any file on a flash drive, the larger the file, the longer it will take to open. Further Word Mobile requires approximately twice the ram as the file size in order to open a file so you may run out of ram when opening a file over 16MB.

Other Articles on the Redfly

1. Redfly "Deep Dive Review
2. Redfly Screen Shots
3. Redfly SoftMaker Screen Shots - TextMaker, PlanMaker and SoftMaker Presentations - More functionality than Word Mobile. Excel Moble and PowerPoint Mobile
4. Redfly Pictures
5. Redfly Under the Hood - A look inside the Redfly Design