Storage and RAID Troubleshooting

A technician is building a workstation for video editing and needs to install two M.2 NVMe SSDs. The motherboard has one M.2 slot that supports both SATA and NVMe, and another that supports only SATA. When the technician installs both drives, only the NVMe drive is detected. What is the most likely reason?

A technician is configuring a new NAS with four 10 TB hard drives. The customer wants maximum usable capacity with fault tolerance for one drive failure. The technician sets up RAID 5, but after initialization, the usable capacity is only 10 TB instead of the expected 30 TB. What is the most likely cause?

A technician is troubleshooting a server that uses a hardware RAID controller with a 1 GB cache. The server experiences periodic write performance drops, and the event log shows 'Cache battery low' warnings. What is the most likely impact of this condition?

A small business server with a RAID 10 array of four 2 TB hard drives experiences a drive failure. The technician replaces the failed drive with an identical model. After rebuilding, the array reports as healthy, but the total capacity is now 2 TB instead of the expected 4 TB. What is the most likely cause?

A user complains that their external USB hard drive is not recognized when plugged into a Windows 10 workstation. The technician checks Device Manager and sees an unknown device with a yellow exclamation mark. What should the technician do first?

A technician is troubleshooting a desktop that fails to boot and displays 'No bootable device' after a power outage. The system has a single SATA SSD for the OS and a separate HDD for data. The BIOS detects both drives. What should the technician check first?

A customer reports that their computer with a RAID 5 array is running very slowly during file transfers. The system uses three 1 TB SATA hard drives. The technician runs a diagnostic and finds that one drive has a high number of reallocated sectors. What is the most likely cause of the performance issue?

A user reports that their RAID 5 array with three 2 TB drives is missing one drive in the RAID configuration utility. The technician finds that the missing drive is not detected by the system BIOS. What should the technician do next?

A technician is called to a data center where a server with a RAID 6 array of six 8 TB drives has experienced a double drive failure. The technician replaces both failed drives. After the rebuild, the array reports as healthy but the performance is extremely slow during normal operations. What is the most likely cause?

A technician is setting up a new file server with four 4 TB SATA SSDs. The customer requires maximum read performance and fault tolerance for up to two drive failures. Which RAID level should the technician choose?

A server with a RAID 6 array of six 2 TB drives experiences a double drive failure. After replacing both drives, the technician starts the rebuild process, but the array status shows 'Degraded' and the rebuild fails. What is the most likely cause?

After installing a second hard drive in a desktop PC, the system boots but the new drive does not appear in File Explorer. The drive is listed in Disk Management as 'Unknown' and 'Not Initialized'. What should the technician do first?

A technician is configuring a RAID 10 array for a database server using four 500 GB SSDs. After setup, the array shows a total capacity of 1 TB instead of 2 TB. What is the most likely reason for this discrepancy?

A small office server uses RAID 5 with three 1 TB hard drives. One drive fails and is replaced with a new 1 TB drive. During the rebuild process, the server becomes very slow and the RAID controller reports an error. What is the most likely cause of the slowdown?

A customer reports that their new SSD is not detected by the BIOS. The drive is properly connected to the SATA port and power supply. What is the most likely cause of this issue?

A user complains that their external USB hard drive is making a clicking sound and is no longer recognized by any computer. What is the most likely cause?

A user reports that their computer is running very slowly and they hear a repetitive clicking sound from the case. The technician checks the SMART status of the primary hard drive and sees a 'Reallocated Sectors Count' value that is critically high. What should the technician do next?

A technician is troubleshooting a server that uses a hardware RAID controller with four SSDs in RAID 10. The server randomly freezes and the event log shows 'Lost communication with drive' errors. The drives pass SMART tests. What is the most likely cause?

A technician is building a workstation for video editing and needs to configure a RAID array for maximum performance without redundancy. The motherboard supports RAID 0, 1, 5, and 10. Which RAID level should the technician choose?

A company's file server uses a RAID 5 array with five 4 TB hard drives. One drive fails and is replaced. During the rebuild, the server crashes and the RAID controller reports that the array is 'Failed'. What is the most likely reason for this catastrophic failure?

A customer reports that their external USB 3.0 hard drive is not recognized when plugged into a specific port on their desktop, but works on other ports. The drive is powered by the USB bus. What should be checked first?

A user's SATA SSD is not detected by the BIOS after a power surge. The motherboard has four SATA ports, and the SSD was previously working on port 0. What is the most likely cause?

A company's file server uses a RAID 5 array with five 2 TB HDDs. After a power outage, the server boots but the RAID array is shown as 'Failed' in the controller utility. The drives are all detected. What is the most likely cause and the best first step to recover the array with minimal data loss?

A technician is tasked with setting up a RAID 10 array using four 500 GB HDDs for a database server. After configuration, the total capacity shown is 1 TB instead of the expected 1.5 TB. What is the most likely cause?

During a routine check, a technician finds that a RAID 0 array with two SSDs is no longer bootable. The BIOS detects both SSDs individually but the array is missing from the RAID controller. What is the most likely issue?

A user reports that their external hard drive, formatted as NTFS, is not showing up in Windows Explorer but is visible in Disk Management as 'Not Initialized'. The drive was working yesterday. What is the most likely cause?

A technician is troubleshooting a server that uses a RAID 6 array with six 4 TB HDDs. One drive fails, and after replacement, the rebuild process is taking much longer than expected. The array is still online. What is the most likely reason for the slow rebuild?

A technician is configuring a RAID 5 array with three 2 TB hard drives for a small office server. After installation, the array is not recognized by the RAID controller. The drives spin up and are detected individually. What is the most likely oversight?

A user complains that their computer, which uses a RAID 1 mirror with two identical HDDs, is running very slowly. The OS is installed on the array. The technician checks and finds that one drive has a high number of bad sectors. What should be done to restore performance and data safety?

A technician is configuring a RAID 5 array with three 1 TB HDDs on a motherboard RAID controller. After setup, the array works but the system occasionally freezes during heavy disk I/O. The drives are all SATA 3 Gb/s and the motherboard supports SATA 6 Gb/s. What is the most likely cause?