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here'sHere's what worked for me:

  1. use "diskutil list"diskutil list to find the small Microsoft Reserved partition you're trying to delete but disk utility (or the clicommand-line equivalent diskutildiskutil) won't allow. Let's say it's on disk 99 partition 400.   (mine was on disk 0 partition 4)
  2. sudo diskutil eraseVolume JHFS+ deleteme /dev/disk99s400sudo diskutil eraseVolume JHFS+ deleteme /dev/disk99s400

The above reformats the partition to journalisedjournaled HFS+ and once you've done that you can just simply delete it (and then resize etc. as you wish).

Note: I've used /dev/disk99s400 because that should not ever work, you have to replace those with the right disk and partition. WARNING: destructive, high risk: ALWAYS do a full back up first before screwing with partitions. ALWAYS.Note: I've used /dev/disk99s400 because that should not ever work, you have to replace those with the right disk and partition.

WARNING: Destructive, high risk. ALWAYS do a full back up first before screwing with partitions. ALWAYS.

here's what worked for me:

  1. use "diskutil list" to find the small Microsoft Reserved partition you're trying to delete but disk utility (or the cli equivalent diskutil) won't allow. Let's say it's on disk 99 partition 400. (mine was on disk 0 partition 4)
  2. sudo diskutil eraseVolume JHFS+ deleteme /dev/disk99s400

The above reformats the partition to journalised HFS+ and once you've done that you can just simply delete it (and then resize etc. as you wish).

Note: I've used /dev/disk99s400 because that should not ever work, you have to replace those with the right disk and partition. WARNING: destructive, high risk: ALWAYS do a full back up first before screwing with partitions. ALWAYS.

Here's what worked for me:

  1. use diskutil list to find the small Microsoft Reserved partition you're trying to delete but disk utility (or the command-line equivalent diskutil) won't allow. Let's say it's on disk 99 partition 400  (mine was on disk 0 partition 4)
  2. sudo diskutil eraseVolume JHFS+ deleteme /dev/disk99s400

The above reformats the partition to journaled HFS+ and once you've done that you can just simply delete it (and then resize etc. as you wish).

Note: I've used /dev/disk99s400 because that should not ever work, you have to replace those with the right disk and partition.

WARNING: Destructive, high risk. ALWAYS do a full back up first before screwing with partitions. ALWAYS.

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Marc Lucke
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here's what worked for me:

  1. use "diskutil list" to find the small Microsoft Reserved partition you're trying to delete but disk utility (or the cli equivalent diskutil) won't allow. Let's say it's on disk 99 partition 400. (mine was on disk 0 partition 4)
  2. sudo diskutil eraseVolume JHFS+ deleteme /dev/disk99s400

The above reformats the partition to journalised HFS+ and once you've done that you can just simply delete it (and then resize etc. as you wish).

Note: I've used /dev/disk99s400 because that should not ever work, you have to replace those with the right disk and partition. WARNING: destructive, high risk: ALWAYS do a full back up first before screwing with partitions. ALWAYS.