AES-256 CTR with ESSIV, is this correct?
It seems in my case IV was supposed to be generated using AES-256 in ECB mode.

ESSIV_IV = E(data=SN, key=HMAC(KEY))


where E is AES-256 ECB, SN is sector number of disk data, extended to 16B (padded with zeros) and KEY is 32B long encryption key (HMAC = SHA-256).