A Molex connector for an IDE HDD supplies 12v and 5v. The SATA connectors for SATA HDDs and SSDs have 12v, 5v, and 3.3v. But I see SSDs and SATA HDDs running on Molex-to-Sata dongles like this: http://www.newegg.com/Product/Product.aspx?Item=N82E16812186163
Do these things actively step down one of the inputs to 3.3v (yeah, right), or just not supply 3.3v? And if there is no 3.3v, why do the SATA drives work? Do they not actually draw from the 3.3v? Do they step down from the 5v if the 3.3v is not present?
A minor point, but it's driving me nuts. Why do devices that require a connector with a 3.3v input work without 3.3v? Is it that the spec calls for 3.3v but all of the SSDs ever made only use the 5v input? Inquiring minds want to know.
Do these things actively step down one of the inputs to 3.3v (yeah, right), or just not supply 3.3v? And if there is no 3.3v, why do the SATA drives work? Do they not actually draw from the 3.3v? Do they step down from the 5v if the 3.3v is not present?
A minor point, but it's driving me nuts. Why do devices that require a connector with a 3.3v input work without 3.3v? Is it that the spec calls for 3.3v but all of the SSDs ever made only use the 5v input? Inquiring minds want to know.