SSD's are block devices -- the operating system sees them as a pile of uniformly sized blocks on which it lays the filesystem. When you read() or seek(), the os always fetches the entire block that the read or seek falls in into memory and takes it from there. Any compression on the ssd will necessarily happen per-block, so seeking is not really any more difficult than on more normal systems.
SSD's are block devices -- the operating system sees them as a pile of uniformly sized blocks on which it lays the filesystem. When you read() or seek(), the os always fetches the entire block that the read or seek falls in into memory and takes it from there. Any compression on the ssd will necessarily happen per-block, so seeking is not really any more difficult than on more normal systems.