But once written to and unmounted, it’s likely to deliver write speeds 60%-70% of those of the host SSD. If encrypted, when it has been freshly made and hasn’t been unmounted, write speed can be abysmal. Sometimes they perform fairly well, and sometimes they’re excruciatingly slow.Īs things stand, the only type of Disk Image which can be relied on to deliver acceptable write performance is the sparse bundle. dmg, sparse disk images, or sparse bundles – is a complete gamble. The TL DR is that writing to macOS Disk Images – whether plain. This article presents a lot more data, which both clarify and confound. ![]() There’s a new twist: results differ when the image is still mounted after creation, and after unmount-remount.Įnc UDRW is 55 MB/s first time, 900 remounted Įnc UDSB is 360 first, 4.3 GB/s remounted
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