User Manual

Copying Media Using the Clone Tool
One of the few things you may want to do before you add media to your project is to clone all
camera original media onto a safe set of backup volumes, for redundancy in case any one
volume fails. Additionally, you should consider cloning all media to an off-site backup as well.
Whether you’re on-set working as a DIT, or doing data ingest at a post facility, the Clone Tool in
the Media page lets you safely and accurately copy media from SD cards, SSDs, or disk drives,
to multiple destinations, with a checksum report (based on a choice of six checksum options)
written to the root of each destination volume that verifies the absolute accuracy of the
duplicate media saved to each destination.
To duplicate media using the Clone Tool:
1 Open the Clone Tool by clicking the Clone button at the far left of the Media Pool
toolbar, which reveals the Clone Tool palette.
2 Click the Add Job button at the bottom left to create a new job. A job item appears
within the Clone Tool palette, with overlays to guide you through its use.
3 Drag a volume or folder from the Media Storage panel to the “Drop source here” drop
zone. Alternately, you can right-click any volume or folder in the Media Storage panel
and choose Set As Clone Source.
4 Next, drag one or more volumes or folders from the Media Storage panel to the
“Drop destination here” drop zone. Alternately, you can right-click any volume or folder
in the Media Storage panel and choose Set As Clone Destination. You can have more
than one destination.
5 If you want to preserve the top level folder name from the source volume or folder, click
the Clone Tool panel’s option menu, and choose “Preserve Folder Name.” The overall
folder structure of the cloned media is always preserved.
6 If you want to change the checksum method used by DaVinci Resolve to verify that
each clip has copied properly, you can choose an option from the Checksum submenu
of the Clone Tool’s option menu. Each option is a tradeoff between the speed of
your file copy operation and the security of the verification process. Greater security
generally means a slower copy operation. The options are:
–
None: Disables data verification, sacrificing safety for speed.
–
File Size: Fast, but minimal data verification. Data verification is done simply
by comparing the file size of a duplicate file with that of the original. “Collision
resistance” refers to whether two files (or a file and an incorrectly duplicated file) may
coincidentally have the same comparison value (be it file size, an error-detecting
code, or a hash). File Size is very fast, but it’s minimally collision resistant.
–
CRC 32: Faster than MD5, but less secure. An error-detecting code rather than the
hash used by the next three options. A “check value” is generated based on the
remainder of a polynomial division of the file’s contents. By comparing the check
value derived from an original file with that derived from a copy, data integrity can be
verified. This is a much faster data verification scheme than MD5 (the default), but it
is significantly less collision resistant.
–
MD5: This is the default setting. A reasonable tradeoff between speed and
security. A hash function generates a 128-bit value that’s unique to a particular file;
Data integrity is checked by comparing the hash value generated by the original
file to that generated by the copied file. MD5 is not as collision resistant as the
SHA options, but it’s a faster operation, and the probability of such collisions in
conventional film and video workflows is probably small.
Chapter – 11 Adding and Organizing Media with the Media Pool 297