helpful-tune3401

A pre clear ended early as "successful" (obviously something went wrong, 14TB finished in only 20 minutes). This is the log. malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting.../usr/local/emhttp/plugins/unassigned.devices.preclear/scripts/preclear_disk.sh: line 1678 : 100/2 - /2 : syntax error: operand expected (error token is "/2 ") malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting.../usr/local/emhttp/plugins/unassigned.devices.preclear/scripts/preclear_disk.sh: line 2709 : [: : integer expression expected malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting.../usr/local/emhttp/plugins/unassigned.devices.preclear/scripts/preclear_disk.sh: line 1678 : 100/2 - /2 : syntax error: operand expected (error token is "/2 ") malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting... malloc: jobs.c:1435: assertion botched free: underflow detected; magic8 corrupted Aborting.../usr/local/emhttp/plugins/unassigned.devices.preclear/scripts/preclear_disk.sh: line 2725 : /boot/preclear_reports/: Is a directory What is going on here? I've googled magic8 but found nothing. The drives are entirely empty and new. Thanks for any assistance. Preclear Error.rtf