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?

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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.

NAND technologyData Retention @ rated P/E cycle
SLC (single-level cell)6 months
eMLC (enterprise multi-level cell)3 months
MLC (multi-level cell)3 months

[source: http://www.dell.com/downloads/global/products/pvaul/en/solid-state-drive-faq-us.pdf ]

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