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CRC Calc

Storage CRC algorithms: CRC32C and the CRC-64 family

Every storage-oriented CRC model in the catalog — CRC32C, the seven CRC-64 variants, and the SCSI/optical-media CRCs — gathered in one place.

5 min readProtocols
01

CRC32C: the 32-bit storage and network default

CRC32C (catalogued as CRC-32/ISCSI) uses the Castagnoli polynomial rather than the Ethernet-style CRC-32, and is hardware-accelerated on modern CPUs — which is why iSCSI, SCTP, and several NVMe transports use it instead of CRC-32/ISO-HDLC.

CRC32C (CRC-32/ISCSI) calculatoriSCSI, SCTP, NVMe transportsCRC32C (iSCSI/NVMe) guideWhere it is used and how to verify an implementation
02

CRC-64: for files and datasets too large for 32 bits

All seven catalogued CRC-64 models are distinct parameter sets, not variations on one algorithm — use the variant a target format actually specifies rather than a generic CRC-64.

CRC-64/XZ calculator.xz archives; a reasonable general-purpose defaultCRC-64/NVME calculatorNVMe end-to-end protectionCRC-64/MS calculator.cab archivesCRC-64/REDIS calculatorRedis Cluster key slots and RDB filesCRC-64/GO-ISO calculatorGo standard library crc64.ISO tableCRC-64/ECMA-182 calculatorHigh-integrity data interchangeCRC-64/WE calculatorWestern Electric / Wireless Ethernet class variantCRC-64 guide: comparing all 7 variantsWhich one to pick
03

Sector and data-integrity field CRCs

A few narrower storage formats define their own dedicated CRC rather than reusing CRC32C or CRC-64.

CRC-16/T10-DIF calculatorSCSI data-integrity fieldsCRC-32/CD-ROM-EDC calculatorCD-ROM sector error detection

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Change CRC parameters and compare standard algorithm results using the browser-based calculator.

Open CRC CalculatorTry CRC-32/ISCSI