Kindle Fire supports USB mode for transferring files between the Kindle Fire and computer. Kindle Fire supports the following file types:

• Documents: AZW, AZW1, TXT, MOBI (unprotected), PRC, DOC
• Audio supported within Music: AAC LC/LTP, HE-AACv1 (AAC+), HE-AACv2 (enhanced AAC+), AMR-NB (.3gp), AMR-WB (.3gp), MP3, MIDI, Ogg Vorbis (.ogg), PCM/WAVE (.wav)
• Images: JPEG, PNG, GIF, BMP
• Video: H.263 (.3gp, .mp4), H264 AVC (.3gp, .mp4), MPEG 4 SP/ASP (.3gp), VP8 (.webm)

Kindle Fire does not support EPUB format.

Based on a few tests, transferring 1.33 GB worth of files through USB took an average of 6 minutes.