base64 is not allowed and input big binary buffer is not allowed,too

[AnRic]

base64 is not allowed and input big binary buffer is not allowed,too
Hi, I am a chinese boy, and my english is wrong, so, first of all, I want to say sorry.
I am a beginner of nodejs, when I use your module, I found:

1. if I use pdf base64, it is error.
2. if I user a small binary buffer, it is success, but if I use a big binary buffer (amost 6MB), it is error,and the error is "fs: Error: EBUSY: resource busy or locked, unlink".