Occasionally, large files become corrupted during download. You can determine whether this has occurred by comparing the checksum of a file before and after download. We have placed checksums for your fastq.gz files in your run directory in a file called md5sum.txt. Compare the values in this file to new checksums calculated on your downloaded files.

To calculate a checksum for a file called myfile.fastq.gz, use:

md5sum myfile.fastq.gz

If the checksums for a file before and after download differ, then the file is corrupt or incomplete and should be downloaded again.