SanDisk customers have been complaining about the company’s Extreme and Extreme Pro portable SSDs suddenly wiping data and, in some cases, becoming unreadable. Complaints go back at least four months, and SanDisk told Ars today that a firmware fix is coming “soon.” However, SanDisk only confirmed a firmware update for the 4TB models, despite an Ars staffer and online users reporting issues with 2TB drives.

An Ars reader tipped us (thanks!) to online discussions filled with panicked and disappointed users detailing experiences with recently purchased Extreme V2 and Extreme Pro V2 portable SSDs. Most users seemed to be using a 4TB model, but there were also complaints from owners of 2TB drives.

In a thread about 4TB Extreme Pro drives in a film and video editors subreddit, a Reddit user called ian__ wrote:

Multiple DITs/Loaders/ACs on both coasts have experienced the exact same failure with these drives over the last month.The symptom seems to be that after a sustained write they will completely lose their filesystem and it’s a total crap shoot [whether] you can recover it or not. The primary way you will see this is that the drive will unmount and you will not be able to get it to mount again, despite showing up in Disk Utility. You can sometimes recover it usi