Western Digital has confirmed it is investigating potential problems with some of its older SMR-based hard drives (as opposed to CMR technology), following reports from multiple data recovery firms about unusually high failure rates.
The affected models include 2 TB, 3 TB, 4 TB, and 6 TB WD Blue and Red drives (model numbers WD*0EZAZ, WD*0EDAZ, and WD*0EFAX) released around 2020, products that previously landed the company in a class-action lawsuit over undisclosed use of SMR (Shingled Magnetic Recording) technology. Tom's Hardware reports that Western Digital said in a statement to Heise Online that it takes the findings seriously and that its engineering teams have launched an internal review.
According to 030 Datenrettung Berlin GmbH, which first published the failure analysis, the issue could have its origins in design-level limitations of SMR technology in lower-capacity consumer drives. SMR increases areal density by overlapping data tracks allowing up to 25% more capacity per platter. However, rewriting data can require adjacent tracks to be rewritten as well, introducing latency and potential instability. These shortcomings have long made SMR unsuitable for certain workloads such as RAID or ZFS arrays. Western Digital's earlier decision not to disclose SMR use in these drives led to a $2.7 million lawsuit settlement in 2021. Now, data recovery labs warn that the same models could suffer physical damage and data loss over time. Users with WD Blue or Red drives in the 2-6 TB range from 2020 onward are advised to check their hardware, as early failure symptoms may include unusual clicking or grinding noises from the platters.













