Archives: FAQ

SSD's in drawer

I have unplugged my SSD drive and put it into storage. How long can I expect the drive to retain my data without needing to plug the drive back in?

It depends on the how much the flash has been used (P/E cycle used), type of flash, and storage temperature. In MLC and SLC, this can be as low as 3 months and best case can be more than 10 years. The retention is highly dependent on temperature and workload. [source: http://www.dell.com/downloads/global/products/pvaul/en/solid-state-drive-faq-us.pdf ]

Which companies provide OS X cloud hosting?

Surprisingly few! I’m not sure why, but it appears only a few of the many companies providing cloud hosting have support for OS X. Here’s a (probably incomplete) list: HostMyApple MacinCloud MacStadium vmOSX Xcloud Xcodeclub (Does your cloud host supports OS X? Let me know!)

What does [xx]% uptime mean in reality?

SLA’s (Service-level agreements) quite often contain promises like ‘95% uptime’, ‘99% uptime’ or ‘99.99% Uptime SLA’. But what does this mean in reality? Here’s a table with the most common values of high availability:

What is the gravity on Mars?

The gravity on Mars is 3.711 m/s². This is 62% lower than the gravity on Earth. This means that Martian gravity is 38% of Earth’s. A person weighing 100 kg here weighs only 38 kg on Mars.

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