No worries, George, thanks for clarifying your words and intention!
The HyperDRIVE manual is indeed quite confusing and rudimentary, so is the user interface of the unit itself (at least for SPACE). Nevertheless, it's a good product which I've been happy enough to own two for dual backups on the field.
I see why you are confused, so am I
CRC checksum is a quite robust and widely used method to check whether two files are identical (and other functions). It basically makes a much shortened version of each file, which are faster to compare than comparing the entire file, bit by bit. If the CRC checksums are identical, you can be 99.999999% (you get the idea) sure the files itself are identical.
Is the above verbatim from the manual? If it is, it doesn't explain what exactly 1) is, and is unclear on what 2) is. In any case, 3) is the one you want: it checks each file you just copied against the ones still left on the card. The SPACE which I have shows status bar for copying, then another status bar for verification - this gives feedback that the unit is actually doing the verification.
Harri, (DarkPenguin, are you there?)
Thanks for staying with me on this. Late yesterday I finally received a reply to my questions from Hyperdrive Customer Care. Here they are:
"Hi.
1. Which verification choice provides the best verification?
They all work the same.
Why are there three of them?
To give you options.
What circumstances are best for each?
Normally, real-time verify should suffice. If you're worried about the health of the hard drive or a memory card, consider using verify HDD or verify card.
2. Which Backup Speed produces the best quality copies?
UDMA66.
Why is there more than one speed?
In case a card is not compatible with UDMA66 mode.
3. Does Visual Backup slow down the backup, even if previewing from the card while copying?
Yes.
4. I was told that you support the Leica RAW format for their D Lux 3, but I don't see it listed in your manual as one of the formats supported for recovery.
You didn't specify whether it was supported for recover. Leica RAW D Lux 3 is supported for viewing. I'll have to check if it's supported for recovery, but in any case, support can be added in a future firmware update.
Thanks and regards,
Jonathan
Customer Care
www.hyperdrive.com"
So ..... Customer Care at Hyperdrive is saying, among several things, that the speed that gives the best copies is, according to their manual, their fastest speed , UDMA66 Mode. I've sent another email to them asking how that fits with other opinions that slower speeds may offer better quality, as well as asking how I will know if a card will not work with UDMA66 Mode speed.
And what is UDMA? I havn't been able to find out online.
If you would like to see exactly what the Colorspace UDMA manual says, you can view it in PDF from Hyperdrive's website.
I'd like to know what you guys think now after seeing it and these answers from Hyperdrive.
Regards,
George Ollen