Disk will not mount, but shows up on System Profiler

hard drivemount

My internal 250GB failed on me the other day, so I replaced it with a new SSD and HDD combo. I have the failed disk connected via USB/SATA, but it will not mount. However, it shows up under System Profiler.

The following is from System Profiler:

USB to S-ATA:

  • Capacity: 250.06 GB (250,059,347,968 bytes)
  • Removable Media: Yes
  • Detachable Drive: Yes
  • BSD Name: disk4
  • Product ID: 0x0731
  • Vendor ID: 0x05e3 (Genesys Logic, Inc.)
  • Version: 90.94
  • Serial Number: 37007
  • Speed: Up to 480 Mb/sec
  • Manufacturer: Genesyslogic
  • Location ID: 0x24130000 / 4
  • Current Available (mA): 500
  • Current Required (mA): 192
  • Partition Map Type: GPT (GUID Partition Table)
  • S.M.A.R.T. status: Not Supported
  • Volumes:
    • disk4s1:
      • Capacity: 209.7 MB (209,715,200 bytes)
      • BSD Name: disk4s1
      • Content: EFI
    • Macintosh HD:
      • Capacity: 184.48 GB (184,484,454,400 bytes)
      • BSD Name: disk4s2
    • Unknown:
    • Unknown:

Best Answer

By SSD and HDD combo do you mean something like a Seagate Momentus?

I'm really confused by you saying that the disk failed (how did it fail?) but then you have connected it by USB and you expect it to work?

The report you posted doesn't show a 

Content:    Apple_HFS

as you might expect to see under Volumes, so it appears to have been corrupted.

If data on this volume is vital and you don't mind spending money to get it back then unplug it right away and take it to a professional recovery service.

If it would be just "nice to have back" then you could try using the First Aid tab of Disk Utility, and see if it can recover the partition(s).

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