The alternative: driving the data out
What driving the data costs, in money and in waiting.
Operating cost during the initial phase, for a standard site generating a stated 20 TB per day, roughly 600 TB per month:
| Cost element | Basis | Monthly |
|---|
| Working drive pool, amortized | Fifteen to twenty 30 TB rugged drives covering fill, transit, verification hold, and spares | ~$350 to $450 |
|---|
| Drive attrition and replacement | Shock and handling failures on daily-shipped media, roughly 2 to 5 percent per cycle | ~$1,500 to $2,800 |
|---|
| Media consumption where drives are retained | If media is held until verified training ingest, or kept as an archive tier: up to about 20 drives per month | $0 to $11,000 |
|---|
| Courier, overnight, daily cycle | About 22 shipping days per month | ~$2,200 |
|---|
| Load, verify, and upload labor | About two hours per day combined, site and upload end | ~$3,300 |
|---|
| Upload facility and port allocation | Fiber-connected upload facility | ~$500 |
|---|
| Total drive-transport operating cost | Data age six or more days end to end; range driven by the retention model, rotate versus retain | ~$8,000 to $20,000 |
|---|
Working drive pool, amortized
Fifteen to twenty 30 TB rugged drives covering fill, transit, verification hold, and spares
~$350 to $450
Drive attrition and replacement
Shock and handling failures on daily-shipped media, roughly 2 to 5 percent per cycle
~$1,500 to $2,800
Media consumption where drives are retained
If media is held until verified training ingest, or kept as an archive tier: up to about 20 drives per month
$0 to $11,000
Courier, overnight, daily cycle
About 22 shipping days per month
~$2,200
Load, verify, and upload labor
About two hours per day combined, site and upload end
~$3,300
Upload facility and port allocation
Fiber-connected upload facility
~$500
Total drive-transport operating cost
Data age six or more days end to end; range driven by the retention model, rotate versus retain
~$8,000 to $20,000
Drive transport is a standard-site bridge, not a dense-site strategy. A high-density site generating about 472 TB per day would require roughly sixteen drives per day, on the order of $45,000 to $60,000 per month, and is operationally marginal. Dense sites take the engineered transport program on the fastest available path.
The lag is the real price of the interim phase. Filling a 30 TB drive at site generation rates takes more than a day, and staging, courier transport, upload, verification, and ingest queueing add the rest. End to end, drive transport delivers training data six or more days after capture, so the training pipeline runs nearly a week behind the fleet. That is acceptable as a bridge and untenable as an end state.
Illustrative planning values for the interim method and the construction alternative. They describe what the program would otherwise pay, not OSI service pricing.
Compare the real throughput of mailing drives.
Drive shipment looks like a way to avoid bandwidth constraints. The catch is the cycle: copy, ship, unload, and wait for the drives to come back before the next shipment can leave. Effective throughput is the data per shipment divided by that whole round trip, not the capacity of the drives.
Sneakernet vs. on-site bandwidth
Effective throughput, mailing drives3.9 Gbps
On-site dedicated circuit10 Gbps
Shipments needed per month
2.8
Drives handled per month
23
Circuit time to move one month of data
4.6 days
What this means
The 10 Gbps circuit moves data faster than the drive shipment cycle. Data also arrives continuously, not in 2.8 batches.
Illustrative planning comparison. Effective sneakernet throughput is the data per shipment divided by the full round-trip cycle, because the next shipment cannot leave until drives return.