What is happening when we INSERT data into HANA DB

Hello all

     When we perform INSERT operation in HANA DB, What is actually happening.

  HANA is an IN-MEMORY database, once we perform INSERT operation, where the data is actually going.

1. delta 1 storage (row storage)

2. delta storage (small column store)

3. main column store.

  All these are residing  in In-Memory.

So when will data go to cold storage(while performing INSERT does it goes to Cold storage and update the memory or first it goes to memory and update the cold storage)

If the second thing happens( First memory and update in cold storage), what if System goes down. In this case we might loose the data.

Please explain me clearly on this.

Thanks in advance.