Source: https://guthlabs.ai/docs/instruments/storage-unit-converter/implementation/

instrument implementation / implementation-contract

# Storage Unit Converter implementation

A source-bound implementation contract for Storage Unit Converter; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-028

**Effect**: Computation or source lookup only

## Input and validation requirements

An extreme finite input overflows plain JavaScript arithmetic to Infinity, and negative storage values require an explicit policy because signed arithmetic returns -2 while a physical storage converter should reject them.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "value": 5,
    "source_unit": "GB",
    "target_unit": "GiB"
  },
  "expected_outputs": {
    "converted_value": 4.656612873077393,
    "converted_unit": "GiB",
    "canonical_bytes": 5000000000
  },
  "working": "1 GB = 1000^3 bytes = 1,000,000,000 bytes. 5 GB = 5 × 1,000,000,000 = 5,000,000,000 bytes. 1 GiB = 1024^3 = 1,073,741,824 bytes. Target value = 5,000,000,000 ÷ 1,073,741,824 = 4.656612873077393 GiB."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/storage-unit-converter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/storage-unit-converter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/storage-unit-converter/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`