[Solved] Too many file or too large size so that cannot boot

[X.L]

Environment:
Host: Window 8.1 Profession with NTFS partition
VirtualBox: 5.0
Guest OS: Ubuntu 14.04 64bit with vdi image size set to 300GB

My Steps to crash this guest OS:
I tried to build Android 4.2 within this ubuntu but build keep been interrupted with something like:
The I/O cache encountered an error while updating data in medium "ahci-0-0" (rc=VERR_UNRESOLVED_ERROR). Make sure there is enough free space on the disk and that the disk is working properly. Operation can be resumed afterwards.
After I put some other files within this virtual OS, it cannot boot up anymore with above error pop up. And the vdi file size is about 49854464KB.

Someone has some idea to make this guest OS back to alive? Thank you so much

[mpack]

Do you have this file on a FAT formatted drive? FAT has a maximum file size of 4GB.

Otherwise, how much free space is on the host drive?

[X.L]

The partition on host OS is NTFS originally, not formatted from FAT or FAT32. And there are more than 200GB spare space available.

[X.L]

Another update:
After I use the CloneVDI.exe-2.10 to clone a new vdi image, I found out surprisingly that the image can boot but old image still can not. The image size are as below:
New one 49247812KB
Old one 49854464KB.

Is it 50GB is a dead line that been hard coded within VirtualBox somewhere?

[mpack]

Is it 50GB is a dead line that been hard coded within VirtualBox somewhere?

No, there is no such boundary.

More likely the original VDI is corrupted somehow.

[X.L]

If the old image is corrupted, then maybe the clone operation really cue it. I donot know. Anyway, the tool CloneVDI really helps a lot. If without it, weeks of work are lost.