The most reliable combination I found for 4GB and larger drives was to put them in an OSX machine, partition them using Disk Utility using an Apple Partition scheme, but only 1 partition of free space. Then take the drive and put it into the SE/30, and create a Mac Driver partition and Macintosh partition using a patched version of HD SC Setup 7.3.5

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Does this advice pertain to flash drive solutions? I ask because my IBM DGHS spinning platter drive is 4.5GB (i.e., "4GB and larger") and I formatted and partitioned it on my SE/30. I run System 6, 7 and 8 on it flawless. I have done so with the SE/30 in stock condition and upgraded. I too used the patched Apple HDSC app though.

In other words, I must assume the "reliability issue" being spoken of here is being directed merely at flash drive solutions for vintage Macs.