Optical disc composed of a phase change material, most often AgInSbTe, an alloy of silver, indium, antimony, and tellurium. Optical discs are most commonly used for storing music (e.g. for use in a CD player), video (e.g. for use in a Blu-ray player), or data and programs for personal computers (PC). The Optical Storage Technology Association (OSTA) promotes standardized optical storage formats. Although optical discs are more durable than earlier audio-visual and data storage formats, they are susceptible to environmental and daily-use damage. Libraries and archives enact optical media preservation procedures to ensure continued usability in the computer's optical disc drive or
Capacity to be alone being allowed "just to lie back and float", and of the "opportunity that the baby has to experience separation without separation". Out of those early experiences emerges the capacity to be alone in (or out of) the presence of others - something which might have to be re-acquired later in life through psychotherapy. A later strand of analysis, drawing on the work on listening of Theodore Reik, has emphasised the importance of the "analyst"'s capacity to be alone in the analytic situation - to remain centred in themselves in the face of the projections and resistances of the patient. André