APC Disk On-line Server NAS-2100 - Manual (Page 34)

9 User name
The user name must not exceed 32 characters. It is case-insensitive and
can contain double-byte characters, such as Chinese, Japanese, and
Korean except:
" / \ [ ] : ; | = , + * ? < > ` '
9 Password
The password must be 6~16 characters long. Avoid using codes that are
easily decipherable.
You can perform the following settings for users:
i. Create
ii. Create Multiple Users
iii. Change Password
iv. Create Private Network Share
v. Assign User Groups
vi. Quota Settings
vii. Delete
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