if no good data after all that, error -36 I/O Error is generated.
That software asks the lower level software to do a re-read. The an error is passed to the higher-level software. This is what can cause the clicking sound on same drives when data are going bad. If the data do not come clean, it reports an error back to the low-level driver, which will request a re-read, and if good data are not obtained the software may ask drive controller to do a recalibrate (seek track 00) where there is a switch confirming the track location. If an error was detected, the drive controller does a re-read of the data, in an attempt to get good data.
The raw data, including the check bits, are fed through the data separator and in almost all cases, good data comes out the other side, with no indication of an error.
This seems like my best option but before buying it I wanted to make sure there isn't a free build in alternative.Įach and every read from a disk drive is done using error correction hardware. I saw that OWC sells software "SoftRAID" that is well rated.
The other issue with a card in general, the mac pro has hard drive trays that slide into the motherboard, making it problematic to run sata power and data cables to the drives. I've read that Apple once sold a card but the consensus was, it was expensive, slow, had battery issues and other 3rd party cards were a better choice.Is software based raid possible using Apple built in Disk Utility?.Which leads me to the following questions: I read that Apple has taken away the raid features in some versions of the OS, I'm using Yosemite 10.10.5 but I'm not sure if this is the reason or if it's something else. The tutorials refer to a raid Tab that isn't visible in my Disk Utility (v13). I'm confused because when I initial researched it seemed like all I would need to buy two hard drives and use Apple's Disk Utility to create the array. I wanted build an internal Raid for my 2009 Mac Pro.