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The Daily Insight

What is wrong with SMR drives?

Author

Rachel Newton

Updated on March 18, 2026

The problem with SMR drives is that when you overlap the tracks like this, it means that there's no way to write to just a single track without affecting the data on nearby tracks. Writing data to an SMR drive requires that the drive scan multiple tracks at once and then rewrite them.

People also ask, are SMR drives bad for gaming?

Since games are mostly static data, an SMR drive should be fine for games. SMR doesn't have any read penalties, it's only writing that's an issue if you fill up the CMR cache. Since you're probably limited by your internet connection download speed, poor write performance shouldn't be any issue either.

Likewise, what are SMR drives good for? SMR hard disks are a good choice if they are primarily used as pure data storage or if a large hard disk is to be used for a PC on which data is stored. They offer more storage capacity and are more energy efficient than CMR, which makes them ideal for archiving tasks.

Also to know, which is better CMR or SMR?

The reason SMR is considered inferior to CMR for many applications is because SMR drives place tracks more closely together than their CMR counterparts. This does not impact read speed, but it has a significant impact on write. Selling an SMR drive in the WD Black line is an insult to the product.

What are the currently shipping SMR drives?

News emerged last week that WD, Seagate and Toshiba are all shipping hard drives using Shingled Magnetic Recording (SMR), a slower form of HDD technology that can result in reduced performance in some types of workloads, but without disclosing that critical bit of information in marketing materials or specification

Related Question Answers

Is Barracuda good for gaming?

The Seagate Barracuda (3TB) is large enough to store all your games whilst leaving enough room for media files, even 4k! The Seagate Barracuda comes with a solid 3TB of storage space for you to mess around with. It is without a doubt, the best all round internal hard drive for gaming.

Is SMR really that bad?

There's nothing wrong with buying an SMR drive if you know what you're getting, but the experience of using SMR is different from a PMR drive. Random write performance on SMR drives is particularly bad, so if you have workloads that depend on it you absolutely don't want to run them on an SMR HDD.

How do I know if my hard drive is SMR or CMR?

The easiest way to detect whether it is a SMR drive is the cache size. Old drives (WDx0EFRX) had 64MB cache whereas new replaced drives (WDx0EFAX) feature 256MB. You can also read the serial number on the disk itself and compare it to a table bellow.

Is wd40efrx a CMR?

Red Plus (CMR) 4TB. WD40EFRX.

What is CMR SMR?

Conventional magnetic recording (CMR) and shingled magnetic recording (SMR) are both recording technologies used by hard drives to physically record data using magnetic tracks.

Is wd40ezrz a SMR?

WD40EZRZ is CMR. We have a list of “known to the community” SMR drives over at smr-drives.141/, together with some additional resources on DM-SMR, HA-SMR and HM-SMR. WD40EZRZ-00GXCB0 - APOLLO (С7K in serial number) 6 heads, SMR.

Is WD Red SMR?

Finally, after starting to make amends towards the end of April 2020, Western Digital has gone one step further at last, and cleaned up their NAS drive branding to make it clear which drives are SMR-based. Re-organizing their Red portfolio, the vanilla WD Red family has become a pure SMR lineup.

How do SMR drives work?

In the simplest terms, Shingled Magnetic Recording (SMR) is a new hard drive technology that allows the tracks on a platter to be layered on top of each other, just like roof shingles on a house, to increase platter density or tracks per inch (TPI).

How slow is SMR?

It can get bogged down during large writes and become very very slow, like 10MB/s on average slow.

Who makes the most reliable hard drives?

There are three active vendors in the consumer hard drive space - Seagate, Toshiba, and Western Digital. While Seagate offers hard drives targeting consumer workloads at their leading capacity points, Western Digital and Toshiba reserve the leading edge for enterprise and datacenter drives.

What is SMR?

SMR is an acronym for “Shingled Magnetic Recording,” an important technology utilized to increase capacity and enable lower cost per TB in hard disk drives. It is primarily used in HDDs that populate the world's largest cloud data centers.

What is SMR video?

Coined in 2010, ASMR (autonomous sensory meridian response) is a relaxing, often sedative sensation that begins on the scalp and moves down the body. On its own, a top ASMR video can garner over 16 million views.

What is TGMR?

TGMR reader is current technology of magnetic recording read sensor which dramatically improves readout amplitude, speed and recording areal density.

How long will a NAS last?

three to five years

Why is WD Red for NAS?

WD Red is. - Error recovery Controls: WD Red NAS hard drives are specifically designed with RAID error recovery control to help reduce failures within the NAS system. Desktop drives are typically not designed for RAID environments where this can be an issue.