bug#42546: error during disk partitioning

[Alexandrov Anatoly]

Hello, during the graphical installation of guix latest 9660, during the manual 
partitioning of the disk, for example, when I want to edit an existing ntfs 
partition, the error "unhandle ntfs type" appears, it is impossible to install 
the OS, on the stable version a crash occurs at this time. I have two disks: 
SAMSUNG SSD, USB HDD. I install the OS on a USB HDD, which has two partitions, 
one of them is external.