Disk Management shows new 4TB disk as 2TB despite using GPT

jumanji said:

Hi @haggis999 ,
I am inclined to think that your system does not support larger than 2TB drives. You may contact DELL support to confirm ( I may be wrong) and discuss the issue. They should be knowing better than anyone of us here.

Attachment 239328

As I posted here yesterday, I have also reached the conclusion that my workstation does not support drives over 2TB. I am too busy at the moment, but when I get some free time I am planning to check this assumption with Dell.

Open file explorer > this PC > view devices and drives > post an image

Download and install Sea Tools for Windows:
SeaTools for Windows |
Seagate

Launch the application > click system tools > click boot drive properties > use the snipping tool to post an image into the thread

zbook said:

Open file explorer > this PC > view devices and drives > post an image

Download and install Sea Tools for Windows:
SeaTools for Windows |
Seagate

Launch the application > click system tools > click boot drive properties > use the snipping tool to post an image into the thread

Thanks for the suggestion. I downloaded SeaTools for Windows, which listed my new disk as 2TB rather than 4TB. That wasn't much of a surprise, but what was unexpected was the indication that all three of my data disks are connected as SAS drives. Only the SSD used as my system disk is listed as a SATA drive. I never knew that I was using the SAS interface in my Dell workstation. Clearly, I need to have another read of the Dell user manual!

However, this does suggest another possible reason for my machine's inability to recognise disks over 2TB. The MPTBIOS that controls the Dell SAS Adapter has not been updated since 2008.

In case you need detailed information for each drive these software provide specifications:

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I have a similar problem. The only real difference is that it is a HD Red drive WDC WD40EFRX but Diskpart, Disk Management, AOMEI Partition Assistant only see it as a 2TB drive. I have 2 other WD 4TB Red drives attached via SATA cables in the machine working perfectly (so BIOS, driver updates seem to be rules out). The disc in question is currently connected to the computer via a USB SATA drive bay whilst I check it out (the drive is relatively young but it was repurposed from a NAS upgrade so wanted to make sure it was OK.
I have followed all the suggestions using DiskPart (including clean and convert) - with no change to the indicted capacity of the disk

Attachment 313262

You can see from the disk model number that it is a 4TB drive but AOMEI Partition Assistant is showing the capacity is only 4 TB
Attachment 313263

CrystalDiskInfo (mentioned in the thread), clearly shows the model number of the drive and that it's true capacity is 4TB
Attachment 313264

I had another recently purchased SATA3/USB interface and got the same result as above.

As I said above, I just wanted to check the health of the disk, before redeploying it as additional storage for a ProxMox virtualization server. This was to be loaded into an Orico 5 Bay SATA3 to USB3/C enclosure. I decided to shutdown the ProxMox server and connect that storage bay to the Win10 box. As soon as it fired up, the 4TB drive's full capacity was recognised.

I've been working on this for days...Moral of the story is to check, check again and then verify via alternative means. It was only on the 3rd SATA3/USB that it became clear that the interfacing devices had the limitation, not the disk! You would think one may be faulty, but not two, but you'd be wrong

Some USB enclosures have a 2 TB limit due to the chipset they use. You need to read the specifications for the enclosures.