independently of usage/wear-out rather age of a drive, i.e. the time spent in the field, affects reliability. Higher-end SLC drives not more reliable than MLC drives. Flash lower replacement rate but more uncorrectable errors than HDD.
J. Böhringer, P. Bühler, and P. Schlaich. X.Media.Press Springer, Berlin ; Heidelberg, 5., vollständig überarbeitete u. erweiterte Aufl. edition, (2011)
M. Gao, W. Xie, C. Lu, and R. Shen. The 3rd International Conference on Internet Multimedia Computing and Service (ICIMCS2011), Chengdu, China, ACM, (August 2011)