01One approved master, one clear version.
Collect only content you are authorized to reproduce in one folder. Keep the names and folder structure the device requires. Record file count, total bytes and approval date. Create a new version when the content changes. Do not mix different content versions within one batch.
02Agree what the player must do.
A filename extension does not establish compatibility. Check the actual audio format, playback order and folder limits in the model’s instructions. For lessons or announcements, the sequence is part of the product’s function.
| Handoff item | Record | Confirm by |
|---|---|---|
| Master files | Version, file count and total bytes | Comparing the file inventory |
| Device | Model and software version | Playing on that device |
| Playback order | Names, folders and required sequence | Checking beginning, middle and end |
| Card batch | Quantity and content version | Logging runs and separating failures |
03Measure parallel copying with verification included.
Run a trial with all intended readers active. Measure each slot: shared connections and verification can change performance compared with one card. More slots do not automatically multiply throughput. Compare file inventories and total size after each run. If using checksums, compare them with the master. These checks do not replace device playback.
- Record active slots and measured speed per slot.
- Time writing, verification and card handling separately.
- Separate incomplete or failed copies; record the cause and rework result.
- Pack only cards with the verification result required by the agreed process.
04Keep a run log and an approved sample.
Record the content version, completed cards, cards requiring rework and the time for each run. Keep the approved playback sample separate. Retest when content or device software changes. For supplier-preloaded cards, use the related service page to prepare the handoff.
Estimate the data-writing time
Measure the write rate per slot while all slots are active. Test one run first if needed. Defaults are examples. Verification, card handling and retries are extra.
Decimal units: 1 GB = 1,000 MB. Content per card ÷ rate per slot × runs. This is not a YOULEN production-time commitment.
Before batch copying
A worksheet for your own records, not a submitted request.