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A Samsung Galaxy S23 Ultra appeared to be working at first glance. It powered on, displayed the logo, and a few seconds later restarted on its own. Over and over, in an endless loop. The owner was primarily concerned about photos and videos that were completely inaccessible in this state.

A two-drive Western Digital NAS ended up in our lab after it stopped displaying stored data. The owner tried to fix the situation himself – he formatted one of the drives – but instead of a fix, data access became completely impossible. This case illustrates well why it's better not to make hasty decisions when dealing with RAID arrays.

Some form of electronic failure (PCB) in hard drives is not uncommon. The problem may lie in the PCB itself, it can be caused by user-induced mechanical damage, or it may involve a combination of issues where the PCB isn't the main culprit, but its technological intricacies still need to be navigated. This particular drive required PCB modifications; fortunately, the data platters and read/write heads were intact.

When switching to a new mobile phone, some users transfer and back up their data immediately. Others postpone this step for various reasons, leaving the old device stored away until the "right" time arrives. This was exactly the scenario with this Lenovo phone.

For successful data recovery from an SSD, it is crucial that the memory chips are intact and the device controller is functioning correctly. One of the most critical complications with SSDs is the failure of their controller, which ensures communication between the memory chips and the computer (or other device). If the controller fails, recovering data from such an SSD can be very challenging – and with SandForce controllers, often impossible.

The Toshiba external hard drive served as additional storage for several years before it spontaneously failed. However, with external drives, it is impossible to completely rule out the possibility that an accidental drop or impact may have contributed to the issue. Fortunately, there was no evidence of extensive mechanical damage to the read heads or data platters, and the disk could be partially initialized. However, the data was only partially accessible, so it was essential to choose the correct procedure from the very beginning.

A WD external drive was used years ago for backing up important data and then forgotten in a drawer. Over time, this backup became the only existing version of the data. Years later, the user needed to access the data again, but the hard drive thwarted their plans. After connecting, it did nothing. The issue could have been caused by the external power these drives require, but it could also be a more complex problem involving the internal drive. In this case, it was a combination of electronic failure and surface damage to the data platters, specifically affecting one of the disk’s magnetic heads.

The journey of this Seagate hard drive was full of hardships. After several years of service, it suffered mechanical damage, and the user lost access to the data. The user made arguably the most irresponsible attempt at data recovery by subjecting the drive to “home repair.” Fortunately, the DIY enthusiast used an appropriate method for opening the top cover of the drive, and after looking inside, realized there was nothing he could do, and carefully closed the drive again. Then, he finally turned to specialists.

The hard drive exhibited typical symptoms of read head and/or data platter failure - it clicked and shut down after a while. The failure occurred without an obvious cause - spontaneously. Western Digital hard drives are usually relatively well manageable when such an error occurs and the cause is not mechanical damage. However, it is necessary to check the condition of the data platter surfaces.

Many users use external hard drives for various purposes. They serve to store expendable data that we can afford to lose in case of drive failure, but also important data that should be stored in at least two copies. Neglecting backups can sometimes backfire at an inconvenient time, and the external drive fails. The age of the drive, how it is handled, and other factors can cause the drive to fail to connect. In the best-case scenario, the drive turns on, makes no unusual sounds, but the data is inaccessible. This was exactly the case here.