> On 24 Oct 2015, at 3:35 PM, Severin Crisp <[email protected]> wrote: > > I have an Elgato 500GB SSD Thunderbolt connection which has disappeared since > I did the latest security update on Yosemite. It appears in System Report as > physically connected to Thunderbolt but is not found with Disk Utility or > Disk Warrior. Shutdown and restart does not bring it to light. > I have not yet tried just unplugging and replugging everything. > Suggestions welcomed! > Severin Crisp
Hi Severin, I somehow missed this post. Has the problem been rectified our do you still require help? If you do require help - Is the external drive a bootable drive? - Or is it a secondary (data) drive? The System Management Controller, NVRAM, and PRAM all store parameters that the system can use to store system settings including boot information. These can become corrupt, and if they do, a reset may make a once invisible drive visible again. The following two links identify how to reset these parameters: <http://support.apple.com/kb/ht1379> <http://support.apple.com/kb/ht3964> The resets above should be performed when problems exist, regardless of whether or not the external drive is bootable. Before doing anything else, these checks should be done because they're easily to do and sometimes work. Cheers, Ronni 13-inch MacBook Air (April 2014) 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz 8GB 1600MHz LPDDR3 SDRAM 512GB PCIe-based Flash Storage OS X El Capitan 10.11 > ____________________________________________________ > > Assoc Prof R Severin Crisp, FAIP, FIP, CPhys > 15 Thomas St, Mount Clarence, Albany, 6330, Western Australia > ph (08) 9842 1950 ( Int'l +61 8 9842 1950) > mail to: [email protected] > <mailto:[email protected]> > ____________________________________________________
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