Which USB Devices Are Supported?
Can You Support My Android Device?
Do I Need A Special "OTG" Cable?
Are there any physical keyboard shortcuts?
Supported: Nexus 7 (1st and 2nd Gen), Nexus 5, Nexus 10, Moto X, Galaxy Nexus, Motorola Xoom, LG G Tab 8.3, Samsung Tab 3 8.0
Compatible: Android 4.0+ devices supporting USB Host. For example: Sony Xperia (Models P and S), Moto G, Samsung S3 & S4, Archos G9, Note 10.1, Galaxy Tab 2, Hisense Sero 7 (N7 2012 Clone)
Not Supported: Devices that do not support USB Host. For Example: Toshiba Thrive, Nexus S, Nexus 4, HTC One X (several), Galaxy Tab 3 7"
Let me know if there are others, I will update the list.
The technical answer is flash pen drives and card readers. The drive/cards needs to be formatted as exFAT, FAT/FAT32, NTFS or Ext2/3/4. HFS+ is not supported, but can be reformatted as one of the supported types.
Devices that may be supported:
Try the free Nexus Photo Viewer, if it works USB Media Explorer should too. If it is not supported by Nexus Photo Viewer, it is unlikely it will be support can be added. The NMI/NPV mass storage drive has come about as far as it can. At this point either a device will work or it will not.
Yes, you need a USB On-The-Go (OTG) cable. These usually need to purchased online and cost anywhere from $1 to $10 USD. A USB coupler and your data cable will not work. OTG cables can break, so a spare may be a good idea. Note: There is no brand that works better or worse with NMI, but the models with a hard plastic end seem to be the most problematic.
For most hard drives, yes. The latest version of NMI supports write for NTFS. Please make sure the drive is receiving enough power to operate before writing to it. See the Hard Drive section for more info.
NMI uses the standard Android keyboard shorts. The Photos screen uses the following shortcuts: