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485GB drive now showing only 7.5GB capacity

I have a drive on a Windows 03 server with a capacity of ~485 GB. Suddenly, this afternoon it shows the drive as having a capacity of only 7.5 GB, with 0 KB available. All of the files on the drive appear to be there and are accessible. In Disk Management, the drive shows "485.09 GB NTFS - Healthy". We use disk quotas, so I figured that was the cause. I went into drive properties > Quota and unchecked "Enable quota management", and rebooted. The issue remained unchanged. I ran Check Disk from explorer, and it came back with no errors. I opened the defrag utility, and in the main screen it shows "Capacity: 7.5 GB, Free Space: 198 GB - 2633%" I analyzed the volume, and the report shows: "volume size 485 GB, used space: 288 GB, Free space: 198 GB - 40%". I attempt to run a defrag and get the error: "Disk Defragmenter cannot defragment this read-only volume".  I saw there were windows updates available, ran them and rebooted.. issue remains. I ran a chkdsk /f from the command prompt, it completed. Chkdsk reported corrections made in free space reported in the MFT file, and reported 508650029 KB total disk space (full report attached). After chkdsk, the issue remained unchanged. I rebooted the server again... same. The other partitions on the same virtual disk do not appear to be affected. No viruses found by MS Forefront. Here are the full specs on this setup: Dell PowerEdge 1900, Dual Xeon 5150 @ 2.66 GHz, 8 GB RAM. PERC 5/i Embedded controller, five 136 GB SAS drives configured w/RAID5 as a single virtual disk, partitioned as: 39MB EISA, 40GB System, 20GB Pagefile, 485GB Data (Data drive is the only drive with this issue).  Windows Server 2003 Standard x64 R2 SP2. This is our production file server. Any help would be greatly appreciated!
Windows OSMicrosoft Server OSServer Hardware

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8/22/2022 - Mon

Dell Online Diagnostics of the storage system (controller & disks) finds no errors with quick test... beginning full test...

Full test of storage system reveals no errors.

First, stop writing anything else to the drive. Obtain a copy of getdataback from:

Run it and recovery your data. After you have data, then you could proceed any test or diagnostic or get replacement.
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