1. What tape is, and how it differs from a hard drive
Magnetic tape stores data on a flexible polymer film coated with magnetic material. The read/write mechanism is a rotating head drum, and the format is inherently sequential. That single difference explains almost everything that matters operationally.
| Hard drive | Magnetic tape | |
|---|---|---|
| Access | Random, instant | Sequential — retrieval takes minutes to hours |
| Visibility | Shows up in asset and monitoring systems | Often absent from asset registers entirely |
| Containment | Usually inside the data centre perimeter | Frequently off-site, in a third-party vault |
| Retention | Tied to the refresh cycle | Often "indefinite" because nobody owns it |
| Content | Current system of record | A snapshot — possibly older, possibly containing data since deleted |
| Audit attention | High | Low — nobody looks at a tape rack |
| Sanitisation | Degauss, then crush | Degauss, then crush |
2. The specific risks in Indian organisations
- Off-site tapes nobody audits. Stored at a third-party facility, accessed by that facility's staff, and reviewed by nobody from your side.
- Snapshots containing deleted data. A tape from 2022 contains personal data that may since have been erased in production. Under the DPDP Act, a deletion request is not satisfied by deleting from the live system if the same data still exists on a tape.
- Reel-based formats that outlive their support. DLT and older DAT cartridges accumulate in cupboards because no one wants to justify destroying them.
- Encryption that gets switched off. Some organisations disable tape encryption for restore-speed reasons, leaving full plaintext copies off-site.
- Tape as an exfiltration path. A single LTO cartridge is a high-capacity removable medium that leaves the building in a pocket.
A useful test. Ask: could you list every tape your organisation holds, where each one is, what period it covers, and who authorised its retention? If any part of that question is hard to answer, the tape inventory is your first action — before buying any equipment.
2. Which Proton degaussers handle tape?
| Model | Tape formats | Notes |
|---|---|---|
| T-1 | DLT, LTO, DDS, DAT | Drawer accepts cartridges; ~20 second cycle |
| T-1.2 | LTO, DLT, DDS, DAT | Oversized drawer; touchscreen field report per cycle |
| T-1.5 | LTO, DLT, DDS, DAT | Sub-5-second cycle — the throughput choice for bulk tape runs |
| T-4 | LTO, DLT | NSA EPL listed; ±20,000 Gauss; standard in government and defence tape runs |
| T-5 | LTO, DLT | NSA EPL listed; 2 Tesla; under 20 seconds — the volume choice |
| 1100 wand | Magnetic media in the field, disk packs, drum memories | For tapes that cannot be moved to a machine |
3. How to run a tape degaussing project
- Build the inventory. Every cartridge: ID, format, capacity, the period it covers, where it is stored, and who owns it.
- Classify each tape's content. Does it contain personal data? Customer data? Anything that was since deleted in production? Anything still within a legal retention period?
- Apply the retention test. Tapes still within a retention obligation stay. Everything else is queued for destruction.
- Consolidate on site. Bring tapes to a controlled location, or use the 1100 wand where tapes cannot be moved.
- Degauss in batches. Load the drawer with cartridges, run the cycle, confirm the field reading.
- Record per cartridge. Tape ID, format, machine, verification value, operator, date.
- Crush. PDS-75 or PDS-100 for volume, with a rear output slide to discharge straight into a bin.
- Dispose of scrap through an authorised e-waste recycler and file the documentation.
- Close the inventory. Update the asset register so those cartridges no longer exist as live assets. That is what stops them being re-inventoried next year.
4. Where tape fits in a full media policy
| Media class | Required level | Method | Proton equipment |
|---|---|---|---|
| Hard disk drive | Purge (+ destroy for classified) | Degauss, then crush | T-1.5 / T-5 + PDS-100 |
| Damaged hard disk drive | Purge | Degauss (crusher may not grip) | T-1.5 / T-4 / T-5 |
| LTO / DLT / DAT tape | Purge (+ destroy for classified) | Degauss, then crush | T-1.5 / T-5 + PDS-75 / PDS-100 |
| Floppy / magnetic card | Purge | Degauss | T-1 / T-1.2 / T-1.5 |
| SSD / M.2 / NVMe | Destroy | Shred (or crypto-erase with key destruction) | PDS-88 / PDS-SSD |
| USB / SD card | Destroy | Shred | PDS-88 |
| Phone / tablet | Destroy | Shred (remove battery first) | PDS-88 |
| SIM / credit card | Destroy | Shred | PDS-88 |
| CD / DVD | Destroy | Shred | PDS-88 |
5. Cost and effort
Tape destruction is cheap relative to its risk. A drawer of LTO cartridges degausses in seconds and the crusher step is fast. The genuine cost is the inventory work, the retention decisions, and getting someone to own the process. Budget for the register to be filled in properly — that is the deliverable that survives an audit.