View Full Version : SSD detected as HDD by OS X

Feb 20, 2013, 02:40 PM
I'm having some problems with a new SSD in a mid 09 1.86ghz macbook air.

I installed it and everything went ok until I checked for trim support (running 10.6.8), found out that Mac OS X has mistakenly identified the SSD as a conventional HDD and therefore won't enable trim. I did a clean install, smc and pram resets, even tried running Lion but I'm having the same problem. I know the SSD supports trim since I tried with Windows 7 on bootcamp and it reports it as enabled.

This is what System Profiler reports of the SSD (it's an apple toshiba unit)

NVidia MCP79 AHCI:

Vendor: NVidia
Product: MCP79 AHCI
Link Speed: 3 Gigabit
Negotiated Link Speed: 1.5 Gigabit
Description: AHCI Version 1.20 Supported


Capacity: 125.5 GB (125,500,104,704 bytes)
Model: APPLE SSD TS128
Revision: A0985002
Serial Number: 01J850005045
Native Command Queuing: No
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Medium Type: Rotational
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified

Is there any way of fixing this?

Feb 21, 2013, 06:48 PM
Maybe try verifying disk? I fond it odd that it comes up as a TS128 but says rotational? Its almost like the SSD itself doesn't know its an SSD