can we recover data after re-installation of centos7 but it was ubuntu server previously? And the data contained was also formatted during installation, would it be possible to recover it completely?
How to recover data after re-installation of centos7?
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If the partition containing the data was formatted, you probably should investigate specialized data recovery tools. The forums at centos.org are a good place to start.
The more that system writes to that drive, the less the chances for recovery.