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Nikon DSLR Cameras
D500
SD or XQD
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<blockquote data-quote="spb_stan" data-source="post: 735409" data-attributes="member: 43545"><p>The most important difference is reliabilty. SD are very old tech in the bus system and lacking error detection or correction. They are phyisiclly weak besides being electically weak.The bus they usewas designed for only floppy disk drives decades ago and was selected for cameras solely to the very low manufacturing costs.They were never intended for critical work and the only reason 2 slots were added to higher end cameas was to try to reduce the risk of bad dats getting written to storage. Cameras not intended for paid work were considered a good compomise.Some cameras sequencially write to the first then the second card is written from the first.Sony does that so they have different speed buses and different style of card so they are no bettter than single slot since if there is a write error to card one,the second card gets the same bad data.</p><p>XQD was designed from day one to be the first pro format card system and is far more capable mechanically and electronically. They have the ability to map out dead or questionable memory addresses.They also have error detection and correction. Their protected unexpoed contacts are a design that is much more reliable and long lasting. </p><p>Even Sony admits the XQD is far more reliable and published white paper which rated them 2 orders of magnitude longer Mean Time Between Failure better than 2 mirrored SD. They reserve XQD for their professional video ENG cameras where reliability problems could result in missing events worth millions of dollars.But those cameras start at about $25,000 and go up to$50,000 How many slots for critical work? One, and not one pro cameraman has mentioned concern. Sony stated that of the first first million sold, they only had one returned for warranty replacement..</p><p>We have all had lost work due to bad SD cards.</p><p>If someone is doing work for hire they will start losing out of gigs if they only have SD in one time only events.</p></blockquote><p></p>
[QUOTE="spb_stan, post: 735409, member: 43545"] The most important difference is reliabilty. SD are very old tech in the bus system and lacking error detection or correction. They are phyisiclly weak besides being electically weak.The bus they usewas designed for only floppy disk drives decades ago and was selected for cameras solely to the very low manufacturing costs.They were never intended for critical work and the only reason 2 slots were added to higher end cameas was to try to reduce the risk of bad dats getting written to storage. Cameras not intended for paid work were considered a good compomise.Some cameras sequencially write to the first then the second card is written from the first.Sony does that so they have different speed buses and different style of card so they are no bettter than single slot since if there is a write error to card one,the second card gets the same bad data. XQD was designed from day one to be the first pro format card system and is far more capable mechanically and electronically. They have the ability to map out dead or questionable memory addresses.They also have error detection and correction. Their protected unexpoed contacts are a design that is much more reliable and long lasting. Even Sony admits the XQD is far more reliable and published white paper which rated them 2 orders of magnitude longer Mean Time Between Failure better than 2 mirrored SD. They reserve XQD for their professional video ENG cameras where reliability problems could result in missing events worth millions of dollars.But those cameras start at about $25,000 and go up to$50,000 How many slots for critical work? One, and not one pro cameraman has mentioned concern. Sony stated that of the first first million sold, they only had one returned for warranty replacement.. We have all had lost work due to bad SD cards. If someone is doing work for hire they will start losing out of gigs if they only have SD in one time only events. [/QUOTE]
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Nikon DSLR Cameras
D500
SD or XQD
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