Why are these 240GB enterprise SSDs reporting only 128GB?
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MellowCedar47
I obtained several SATA SSDs that are labeled as 240GB, including the Micron MTFDDAV240TDS and Intel SSDSCKKB240G8. However, Windows Disk Management reports only about 120GB of usable space on each drive. Firmware updates did not change the capacity. These drives came from discarded Cisco server equipment, so I'm wondering whether they were configured with RAID, reserved space, or some enterprise capacity limit. Is there a safe way to restore the full listed capacity?
CrystalDiskInfo reports the Micron drive as 128.0GB with 250,000,000 sectors. There is no obvious missing partition or unallocated area. The other drives may also have been configured for server use.
Answers
The CrystalDiskInfo output shows that the Micron drive is presenting exactly 250,000,000 sectors, which is about 128GB. That means this is not simply a hidden partition or a filesystem issue; the drive’s controller is reporting a 128GB maximum addressable capacity. A 240GB version should report roughly 480,000,000 sectors.
Enterprise SSDs can be provisioned with a reduced capacity, and some server systems can apply a host-protected area or vendor-specific configuration. Check Disk Management for unallocated space, but if the disk itself is only 128GB there is nothing Windows can unlock. Secure erase may remove partitions and data, but it generally will not undo a firmware-level capacity limit. Do not rely on these drives for important data until they pass a full capacity and write/read test.
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Be cautious with advice to use Intel’s storage utility. The Intel tool is intended for supported Intel SSDs and is not a general-purpose utility for changing the capacity of a Micron drive. Enterprise firmware settings are often vendor-specific, and forcing the wrong firmware or configuration command can permanently disable the SSD.
You can try the manufacturer’s own secure-erase or sanitize procedure after backing up anything needed, but there is no guaranteed consumer method to restore capacity that the controller has deliberately hidden. If the drives still report 128GB afterward, treat them as 128GB drives or recycle them rather than trying random firmware tools.
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The model names and the reported devices need to be separated carefully. The Kingston drive in the diagnostic output is a 256GB NVMe SSD, the ADATA device is a 1TB hard drive, and the Micron MTFDDAV240TDS is the one reporting 128GB. The label or part-number lookup alone does not prove what capacity this particular unit is currently configured to expose.
You can use `diskpart`, select the disk, and run `detail disk` to confirm the total size, then inspect Disk Management for unallocated space. If the total disk size is still around 119GB after deleting partitions, the limitation is at the drive level rather than caused by RAID metadata or a duplicate-data safety feature.
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MellowCedar47: That makes sense. I’ll verify the disk size after removing the existing partitions, but I won’t assume a secure erase can turn 128GB into 240GB. If the controller continues reporting 250,000,000 sectors, I’ll use them only for noncritical storage.