Reddit, I opened up my Acer Aspire One (ES1-132) recently in the hopes of upgrading the 32GB SSD. It turns out the SSD is eMMC so it is soldered to the motherboard.
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Carte SSD pour ACER Aspire one ZG5 8Go [CARA-1095] - 10.00 € : Spécialiste de la vente de pièces détachées d'occasion pour PC portables et PC fixes