Transcend 8GB JetFlash V10 USB 2.0 Flash Drive – 6+ years old – would not create a 2nd partition no matter what I tried on Windows 10 Version 1607.Sandisk Extreme USB 3.0 Flash Drive – 32GB – 2 years old – worked flawlessly.Mostly the older and/or cheaper drives didn’t work, but most of the newer and/or name brand drives did work.įinally I narrowed it down to two different models, both my favorites: Partition, (only logical drives may be created). More partitions may be created), or 3 primary partitions and one extended Partitioning format and the disk contains either 4 primary partitions, (no It may be that the disk is partitioned using the MBR disk Specifyĭifferent size and offset values or don't specify either to create the maximum It may be that there is insufficientįree space to create a partition at the specified size and offset. Some would allow me to create a 2nd partition on a removable Flash Drive, others would not giving me an error: DISKPART> create part pri
I tested on several different USB makes using my Windows 10 (version 1607) laptop. This has become even more interesting since Windows Server 2016 came out, with a base WIM image for standard Server SKU that is over 4GB in size. However, the problem here is that the hidden partition uses a special UEFI app that is not signed, so it won’t work on UEFI machines with Secure Boot enabled.
Why is this important? Well as I mentioned in another blog post, as more and more people are booting to UEFI, on USB flash drives formatted with Fat32, with WIM images over 4GB in size, that causes a problem because Fat32 can’t hold files over 4GB in size.Īnother solution would be to use the Rufus tool to split a USB drive into multiple partitions with a hidden fat32 partition. Mike Terrill (and Mike Niehaus) already beat me to the punch with some posts, but I wanted to share my results. This took several of us by surprise, because historically, this hasn’t been supported widely without converting to a Fixed disk or something. Hey all, back from a week at the Microsoft MVP summit, a Week in the UK, and a week in Arizona.Ī few weeks ago at the Microsoft MVP summit, an engineering manager with the Windows Product group made an offhand comment about formatting a removable USB drive with two partitions. Perfect for installation of large (over 4GB) WIM files on UEFI machines! TL DR – Starting with Windows 10 Insider Preview Build 14965, you can format any “Removable” USB Flash Drive with more than one partition.
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