no, the person you're replying to is correct. the rule is about the sound of what follows, not whether or not it's a consonant/vowel: - an SSD if you pronounc

no, the person you're replying to is correct. the rule is about the sound of what follows, not whether or not it's a consonant/vowel: - an SSD if you pronounce it ess-ess-dee - a universal constraint - vowel but a is correct here due to sound - an SQL database - again, pronunciation dependent