I can download large files from my pi at 900mb/s and upload around 800mb/s. The hard drives attached to the pie are formatted ext3. If you use an NTFS drive tho

I can download large files from my pi at 900mb/s and upload around 800mb/s. The hard drives attached to the pie are formatted ext3. If you use an NTFS drive though, you will get speeds around what you are describing.