#Iflash cf serial#

The CF card takes 7.71s to fill the read-ahead cache, while the faster SDXC card 5.23s, so the iPod spends close to 50% longer accessing the drive when using the slower CF card. The screenshots below shows the drive i/o activity playing a video file. I will also measure the time required to boot from reset, and how long the iPod takes to fill its read-ahead cache with each card. So to see that visually I setup my digital storage scope to measure the active time for the drive i/o circuitry on the iPod – this will show us how long the iPod spends actually reading from the ‘drive’. The access times for the slower cards will much longer than the faster card – so while the slower cards may draw lower peak currents, they will draw it for much longer. This can be explained by the fact that while the faster card draws higher peak currents, it probably spends a lot less time doing so. However, as can be seen by the average current draw over 60 minutes – and the final average power consumption figure, the difference is minimal between the cards.

Peak Current, Minimum Current and Average Current over 60 minutes of Music Playback.Īs we have seen the peak current drawn varies by a large amount between the test cards – you pay quite a heavy current draw penalty by using the ultra-fast UHS-I card. So after connecting the iPod to my bench power supply, the probes of my current meter and logger are attached and the measurements can begin… So before we do runtime tests, it would be good to get some baseline power consumption measurements of the various combinations. New 850mAh Battery (thick iPod battery)Īll the cards have exactly the same files added in the same order after the iPod is restored using iTunes.So I opted to test a slower SDHC card and a new UHS-I SDXC in my comparison with the CF card.

#Iflash cf serial#

As SD card technology uses a serial transmission method, I expect power consumption to increase with increasing card speeds. So for this test I decided to use the newest 7g iPod Classic, as this was donated to me for test. The iFlash used with a CF card as shown in my previous article will double the runtime compared to the original Hard Drive, but how does the CF compare to using my latest gen SD-CF Adapter and an SD card?