Sequential vs random disc access - is LR more of one than the other?

I'm deciding on a new build for photoediting and based on what I've read will be going with some SSD drives (one for OS/apps, one for the LR catalog, cache, previews and LR/PS work area). Edited photos will be taken off the SSD for long term storage on HDD.
Technical reviews on SSDs discuss their capabilities primarily in terms of random versus sequential read/writes.
I understand that LR (and PS) make use of a mixture of random and sequential read/writes. Obviously applying a keyword to 35 separate images is going to be a random write operation, whereas generating a 1:1 preview in Develop seems to me more likely to involve sequential read/write.
My question is this: under "normal" use (and I accept that there really is no such thing, but I am talking about what I expect the vast majority of users find themselves doing on a daily basis i.e. importing RAW captures, applying metadata, developing and printing), what would be the best way to describe LRs use of a hard disc? On the whole, is there more sequential or random disc access going on? More reading or writing?
Thanks to any bright spark out there who can illuminate me...I've found it difficult to get a handle on this from the net.
Dave M

Lee Jay, random catalog and images sequential seems to fit with what I would imagine is the case but as clvrmnky points out there can be alot going on at the controller level too.
Clvrmnky agree one can't generalize (in fact that's my concern about one user being only one data point), and your comments re good media, backups etc. are all good pieces of advice (as it happens ones that I took on board many years ago but still valuable to repeat in fora like this again and again).
You do suggest keeping the ACR cache and LR catalogue on separate discs however. I had planned on keeping them on a 256 GB Crucial C300 SSD drive. What would be the advantage of keeping them on separate drives?

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Sequential vs random disc access - is LR more of one than the other?

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