Use the strings command again, but specify the encoding option strings data01 -e {b,l}. Remember when the "test" file was deleted? The rm command was used, not shred. The file name data still resides in the file table and is recoverable because of this.
Many people are under the impression that hard drives need to be wiped with multiple passes to prevent recovery of data. This is simply untrue with modern hard drives. According to the National Institute for Standards and Technology, “Studies have shown that most of today’s media can be effectively cleared by one overwrite.”
