Both models are 4Kn drives.
The -600 supports Instant Secure Erase while the -604 supports Secure Erase but only by overwriting the data. This would imply that the -600 model supports Full Disk Encryption (FDE) while the -604 does not.
Instant Secure Erase is a cryptographic erase, ie the encrypted data are rendered unintelligible by discarding the internal encryption key.
A non-encrypted drive can only be erased by overwriting every sector. That may take several hours.
https://documents.westerndigital.co...t-manual-ultrastar-dc-hc520-sata-oem-spec.pdf
https://documents.westerndigital.co...ata-sheet-part-numbers-ultrastar-dc-hc520.pdf
The -600 supports Instant Secure Erase while the -604 supports Secure Erase but only by overwriting the data. This would imply that the -600 model supports Full Disk Encryption (FDE) while the -604 does not.
Instant Secure Erase is a cryptographic erase, ie the encrypted data are rendered unintelligible by discarding the internal encryption key.
A non-encrypted drive can only be erased by overwriting every sector. That may take several hours.
https://documents.westerndigital.co...t-manual-ultrastar-dc-hc520-sata-oem-spec.pdf
https://documents.westerndigital.co...ata-sheet-part-numbers-ultrastar-dc-hc520.pdf
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