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NASGRADE

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NAS Drives

What belongs in an array and what does not: CMR versus SMR, endurance and TLER, NAS-rated lines, and the $/TB math of shucking.

Where to start

Comparisons

Glossary terms

CMR
Conventional magnetic recording — the NAS-safe way to write.
SMR
Shingled recording — denser, but slow rewrites break RAID rebuilds.
TLER / ERC
A drive timeout limit that keeps RAID from dropping good disks.
NAS-Rated Drive
A drive tuned for 24/7 array duty and vibration.
Shucking
Extracting a bare drive from a cheap external enclosure.

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