CMR vs SMR Hard Drives -What’s Different and Which Is Better?

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If you’re in the market for a new mechanical drive, you may have noticed that you have a choice between SMR and CMR drives, but what’s the difference and which one is right for you?

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Hi! My name is Sydney Butler and I’m part of the writing team at Online Tech Tips, an online tech magazine that provides daily useful computer tips in an easy to understand format. We’ll have new videos posted to the channel twice a week in which I’ll cover a wide range of tech topics, including reviews, how-to guides, tips and tricks, and lots more.

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1. **PMR (Perpendicular Magnetic Recording)**: This is a technology used in hard disk drives (HDDs) to store data. In PMR drives, the magnetic bits are aligned vertically (perpendicular) on the disk platter. This allows for higher data density compared to older longitudinal recording methods.

2. **CMR (Conventional Magnetic Recording)**:
- CMR drives are the first generation of PMR drives. They use traditional PMR technology.
- In CMR drives, data tracks are written sequentially, and there is no overlap between adjacent tracks. This makes them suitable for general-purpose storage.

3. **SMR (Shingled Magnetic Recording)**:
- SMR drives are the second generation of PMR drives.
- In SMR drives, data tracks overlap (like shingles on a roof), allowing for higher storage density. However, this overlapping arrangement can impact write performance.
- SMR drives are commonly used for archival storage or applications where write speed is less critical.

4. **Both CMR and SMR use PMR**:
- Both CMR and SMR drives utilize PMR technology for data storage.
- The difference lies in how they organize data tracks on the disk platter.

Mzansi

Totally new information to me. Thank you!

geezergeek

Excellent presentation, easily understandable, explaining the technical info I would ask for in order to a NAS drive. Many, many thanks!

jasonbutler

IIRC some NAS do not work well with SMR drives. Be sure to check manufacturer recommendations.

jeffbergstrom

Thanks for the info on what each type suits for, just what I needed!

SirJohnHolmes_I

Which of the two types is more robust and less susceptible to bad sectors and data rot? (Well I know they will come eventually but what I mean is, which of them will stay in good shape longer?)

SeminarChauffeur

thanks for the Explanation. wasn't even aware to be honest. Currently have Red WD drives running 24/7 for a plex server, and seedbox. Not entirely sure what would be better. Shame WD was shady towards there consumer, really don't like hearing things like that... Thanks for explaining. Much appreciate the content.

piratedragon

I wouldn't touch the SMRs for any NAS. Stay away from SMRs...In most applications, CMRs will do the job just fine.

azzamtony

SMR would not be good for backup or NAS, it would be slow

actiontower

Which type of Hard drive is better for long term data storage?

pappi

there is a reason larger capacity HDDs still use CMR.

lottery

Which one has fastest read and write?

7200 Rpm with smr
Or
5400 Rpm with cmr

TechDEEM

Both CMR and SMR drives are PMR drives. CMR is first generation PMR, and SMR is second generation PMR. Both CMR and SMR use PMR.

azxtra

Would you recommend a normal new SMR disc or a refurbished one that is CMR both have a 2 year warranty?
Or, for example, for the same price a normal CMR disk of 8tb or a refurbished 12tb for the same price?

milospavic