Установите CoreOS на тонкий клиент HP

Я пытаюсь установить CoreOS на тонкий клиент HP, но не могу отформатировать флешку. я создал загрузку USB в соответствии с https://github.com/jriguera/coreos-usb-creator - тогда я могу войти в тонкий клиент, но когда я пытаюсь установить CoreOS, я получаю следующую ошибку

khine@coreos /tmp $ sudo su
bash-4.2# coreos-install -d /dev/sda -C stable -c cloud-config.yml
Checking availability of "local-file"
Fetching user-data from datasource of type "local-file"
Downloading the signature for http://stable.release.core-os.net/amd64-usr/766.3.0/coreos_production_image.bin.bz2...
2015-09-21 15:49:14 URL:http://stable.release.core-os.net/amd64-usr/766.3.0/coreos_production_image.bin.bz2.sig [543/543] -> "/tmp/coreos-install.kGAdApmypF/coreos_production_image.bin.bz2.sig" [1]
Downloading, writing and verifying coreos_production_image.bin.bz2...

bunzip2: I/O or other error, bailing out.  Possible reason follows.
bunzip2: No space left on device
    Input file = (stdin), output file = (stdout)
Cannot write to '-' (Broken pipe).
gpg: Signature made Wed Sep  2 04:32:09 2015 UTC using RSA key ID E5676EFC
gpg: key 93D2DCB4 marked as ultimately trusted
gpg: checking the trustdb
gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
gpg: BAD signature from "CoreOS Buildbot (Offical Builds) <buildbot@coreos.com>" [ultimate]
1: Download of coreos_production_image.bin.bz2 did not complete
141: Cannot expand coreos_production_image.bin.bz2 to /dev/sda
1: GPG signature verification failed for coreos_production_image.bin.bz2
/dev/sda: 2 bytes were erased at offset 0x000001fe (PMBR): 55 aa
/dev/sda: calling ioctl to re-read partition table: Success
bash-4.2#

Если я попытаюсь смонтировать диск, я получу следующее:

bash-4.2# mount /dev/sda /mnt
mount: /dev/sda is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sda,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

флэш-накопитель составляет 500 МБ - какие-либо рекомендации по установке coreOS на тонкий клиент HP t5720?