2 sachen, die mir da einfallen:
1)
vielleicht auch eine interface sache?
schon geschaut, mit welcher "negotiated link speed" die interne verbunden ist
der speedtest klingt imho ein bisserl nach 3Gbs
kannst im systemprofiler nachschauen
2)
im handbuch von blackmagic speed test (ueber hilfe erreichbar)
steht ganz am schluss ein interessanter abschnitt bez
SSD geschwindigkeit und dass manche hersteller
da quasi falsche angaben machen insofern, dass sie
interne kompression verwenden
wurde auch unlaengst auf macintouch diskutiert:
https://www.macintouch.com/forums/showt ... 3#pid13403
zitat:
I just noticed this passage about SSD performance at the end of the Blackmagic Disk Speed Test manual (available via Disk Speed Test help within the app):
Blackmagic Design Wrote:
Important note about Solid State Disk (SSD) speeds
Some models of SSD cannot save video data at the speed indicated by the manufacturer because the disk uses hidden data compression to reach these higher write speeds. This data compression technique can only save data at the manufacturer’s claimed speed when storing simple files or simple data, such as blank data. Video data includes video noise, and more random pixel data which does not compress much, so the true speed of the disk is seen.
Some SSD’s can have up to 50% lower write speed than the manufacturer’s claimed speed, so even though the disk specifications claim an SSD is fast enough to handle video, in reality the disk is not fast enough for real time video data capture. Hidden data compression mostly affects capture and often these disks can still be used for real time playback.
Use Blackmagic Disk Speed Test to measure accurately if your SSD will be able to handle uncompressed video capture and playback. Blackmagic Disk Speed Test uses data to simulate the storage of video so you get results similar to what you will see when capturing video to a disk. This will let you find models of SSD that work well for video capture. In our testing, we have found larger newer models of SSD, and larger capacity SSD’s are generally faster. Blackmagic Disk Speed Test also tests the speed of disks connected to eSATA docks and other interfaces, which can affect disk performance.
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