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TRIM support for SSDs

SSDs introduced fast reads and writes compared with HDDs, but quickly showed considerable performance degradation after short use. Existing operating systems did not work correctly with SSD controllers: instead of writing zeroes to empty blocks, they marked whole blocks as deleted. Because SSDs write blocks of a fixed size, this meant reading the area again, modifying it (writing zeroes), then writing the data.

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Configuring an external time source for Network Time Protocol (NTP)

Each domain structure has one AD server holding the relevant FSMO role, specifically the (PDC) emulator, responsible for time synchronisation throughout AD. The AD server holding the (PDC) emulatorrole is at the top of the DC hierarchy and cannot synchronise time with itself. Its default source is time.windows.com. Unfortunately, this source is often unavailable due to overload, so I recommend another source, such as tik.cesnet.cz

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