The trouble with interrupting a write operation is, you can often corrupt the FAT (File allocation table), which is how the the computer knows where everything is, and how big it is, etc..

Once that is out of whack, you may find the computer writing to disk sectors that already have data on them, adding to the problem (but maybe not immediately, you never know when). One never knows, so best to be safe than sorry. If it happens again, and THIS time no doubt you will have a backup ( ), I would recommend a complete reformat of the drive, to get the FAT back on track.... THEN reload the data.

Writing to a disk that has already become damaged is just too risky until it is reformatted... (IMO)